Apple Macintosh PowerBook 1400 Manual de usuario

The information and illustrations in this chapter provide an overview of yourMacintosh PowerBook system and get you started using the computer. Tobegi

10Chapter 1Opening the display1Slide the latch to the left and lift up the display.2Position the display at a comfortable viewing angle. You can adjus

Problems with hardwareFloppy disk driveI can’t eject a floppy disk.m The disk may be stuck. Restart the computer, holding down the button onyour track

Hard disk driveThe computer won’t start up from the internal hard disk, or the hard disk icon doesn’tappear on the desktop.m There may be a temporary

KeyboardTyping on the keyboard produces nothing on the screen.m Make sure the program you’re using is set to accept text input. Usually youneed to set

m If tilting the display affects the flickering, there may be a loose cable.Contact an Apple-authorized service provider, or call the AppleAssistance

The pointer won’t move from one monitor to another. m The pointer moves between monitors in the area where the monitor iconstouch in the Monitors &

The printer does not appear in the Chooser.m Make sure you’ve selected the correct kind of printer on the left side of theChooser window. For example,

SCSI equipment and SCSI disk modeExternal SCSI equipment doesn’t work, or a hard disk icon does not appear on thedesktop.m You cannot use password pro

m Make sure you are using the correct cable for SCSI disk mode. The HDI-30SCSI Disk Adapter is about 10 inches long, is dark gray, and has 30 pins int

Problems with equipment connected to your computerIf a problem occurs while your Macintosh PowerBook is connected toequipment such as SCSI equipment,

Problems with networks and file sharingSolutions to common problemsIf you are having problems using the network or file sharing, try the followingbefo

Removing the battery label (if necessary)Most new PowerBooks are shipped with a label covering the battery toprotect it from losing its charge complet

Solutions to other problemsThe computer I want to connect to doesn’t appear in the Chooser. m Make sure the computer you’re trying to connect to is tu

A message says that file sharing can’t be turned on. m Make sure AppleTalk is turned on in the Chooser.m Make sure you have at least 400K of available

The file-sharing section doesn’t appear in the Sharing Setup control panel. m You may have turned off AppleTalk or file sharing using the ExtensionsMa

The modem didn’t dial the phone number.m Check that the phone cord is plugged into the computer and into a workingphone line.m Try dialing the number

This chapter provides a step-by-step approach to diagnosing and solvingproblems involving system software and hard disks. Try the steps listed ineach

Follow these steps to reset the PRAM and NVRAM:1. Shut down your computer.2. Make sure the Caps Lock key is not engaged.3. Position the fingers of you

3 Turn off troublesome extensions using the Extensions Manager control panel.Tips for locating problem extensions:m If you recently installed a new it

Testing your hard diskThe following steps will help you determine whether you have a problemwith your hard disk or a problem with the system software

3 In the list of drives, click the disk you want to test.4Pull down the Functions menu and choose Test Drive.5When a message tells you that testing is

Turning th e computer onTo tur n on the computer for the first time:mPress the Power key (marked with “on/off”) at the upper-right corner of the key

Reinstalling the Mac OS system softwareWhen should you install system software?Your computer came with all the necessary Mac OS system software instal

Doing a normal installationFollow the steps in this section to do what is commonly called a “normal”installation of system software.If you’re installi

Next, a screen appears describing the four steps in the installation process.Step 1: Read important informationClick the first button to read about t

Step 2: Update your hard disk driverHard disks with old drivers might cause problems after reinstalling systemsoftware. Your computer might not start

Click the second button in the main Install Mac OS screen to update yourdisk drivers.After you click the second button, you first see a dialog box ask

3When you’ve finished updating the drivers on all your disks, close the window to quit theDrive Setup program.Step 3: Choose a disk for installationC

You see a message if you don’t have 70 MB (the amount necessary for thestandard installation) of available space on the disk you choose. Dependingon t

1 In the dialog box that appears, select the software you want to install. Note: Your screen may look slightly different from the picture below.Rememb

Installing a customized system: The Install Mac OS program installs thesoftware recommended for your model of computer. You can use theCustomize optio

Doing a clean installationThis section provides instructions for what is commonly called a “clean”installation of system software.A normal system soft

Problems turning the computer on?mNothing happened when you pressed the Power key.The battery may be drained. Make sure you plug in the power adapter,

The following screen appears.3Click Options.4In the screen that appears, click the checkbox next to Create New System Folder, thenclick OK. 5Click Sta

Doing a custom installationFor most computer users, the installation procedure described in “Doing aNormal Installation” is best, because it automatic

2Click the fourth button on the main Install Mac OS screen. The following dialog box appears.3Click Customize. The following screen appears.Note: Your

4Select the software you want to install. You can choose to install some of the optional software described in “Step 4:Install the Software” earlier i

5Click Start. If your disk has problems that can’t be repaired: Use a third-party disk repairutility to see if it can repair the disk. If you don’t ha

The Custom Install dialog box appears, listing all available components forthe selected software product.8Scroll through the list of components and cl

IIIpartAppendix A Health, Safety, and Maintenance TipsAppendix B Using Your KeyboardAppendix C Installing Expansion CardsAppendix D Making Backup Flop

Health-related information about computer useMuscle soreness, eye fatigue, and other discomforts and injuries sometimesassociated with using computers

mYou see a picture of a disk with a blinking question mark on the screen.This icon usually means that the computer can’t find system software onthe ha

Musculoskeletal discomfortAs with any activity that involves sitting for long periods of time, using acomputer can make your muscles sore and stiff. T

Eye fatigueEye fatigue can occur whenever the eyes are focused on a nearby object for along time. This problem occurs because the eye muscles must wor

Keyboard and trackpadm When you use the keyboard and trackpad, your shoulders should berelaxed. Your upper arm and forearm should form an approximate

Some computer users may develop discomfort in their hands, wrists, or armsafter intensive work without breaks. If you begin to develop chronic pain or

External monitorIf you use an external monitor, this suggestion may be helpful.m If possible, arrange the monitor so the top of the screen is slightly

Important care and safety instructionsFor your own safety and that of your equipment, read and follow all theinstructions in this section. Keep these

m Keep dirt and liquids away from the ports on the back panel, the keyboard,and the trackpad. If you spill any food or liquid onto the computer, shut

Caring for batteriesAlways handle batteries carefully.m Always put the battery cap on the battery when the battery is out of theMacintosh PowerBook. T

Handling floppy disks125° F (52° C)50° F (10° C)Keep disks dry.Do not use apencil or an eraser on a diskor disk label.Store disks attemperaturesbetwee

Traveling with the Macintosh PowerBookIMPORTANTAlways bring either the CD-ROM disc or the Disk Tools floppydisk that came with your computer when you

Learning the basicsIf you are new to the Macintosh, you should begin by looking at the easy-to-use program called the Macintosh Tutorial. The tutorial

m Ta ke th e n ecessary plug adapters if you’re traveling overseas. (You mayneed to use them with the power cord.) You do not need a voltagetransfor

Storing the Macintosh PowerBook1Save your work on a hard disk or floppy disks.2Press the Power key and click shut down, or choose Shut Down from the S

The keyboard on the Macintosh PowerBook 1400 series computer works inmuch the same way as the keyboards on other computers and on electrictypewriters.

Special keys on the Macintosh PowerBook 1400 series keyboardArrow keys Move the insertion point as an alternative to using the pointing device. In som

Typing special characters and symbolsYou can type a variety of international and other special symbols andcharacters (including characters with diacri

If you press the Option key, Key Caps outlines lightly the keys that you canuse in combination with letter keys to type letters with accents or otherd

Special key combinationsIf difficulties with your trackpad or computer don’t allow you to use standardmethods of quitting a program or restarting your

You can purchase cards to augment your PowerBook’s operation. Two kinds ofcards are available for the computer. You can install two different types of

2Move your finger on the trackpad so that the tip of the arrow (8) points to the questionmark in the upper-right portion of the screen.3With the tip o

Installing a RAM cardYou need the RAM card and small Phillips and flat-blade screwdrivers for theinstallation.Make sure you are installing a RAM card

161Installing Expansion Cards3 Remove the battery from the computer.If you’re unfamiliar with this procedure, follow the instructions in “Removingor R

5Place your finger under the top edge of the keyboard and gently fold it forward so thatthe keyboard rests upside down on the lower part of the comput

6 Remove the six screws holding the metal heat shield in place. Then lift out the heatshield and set the shield and screws aside.Use the small Phillip

164Appendix C7 Locate the vertical connector for the RAM card near the right side of the computer.The connector is approximately 2 inches in from the

8 Carefully remove the RAM card from its packaging and position it above the area forinstallation in the computer.Hold the card by its edges on the le

m If a RAM card is already installed, slide the right edge of the card abovethe card guide.10 Lower the left side of the card so that its connector is

11 Replace the metal heat shield and fasten it in place with the screws.Slide the front edge of the heat shield under the case, then lower the back of

12 Replace the keyboard by folding it backward and lowering the top edge into place.168Appendix C

13 Replace the speaker grill by lowering it into the opening above the top row of keys. Slidethe grill to the right to secure it.Position it so that t

Reviewing the basicsYou can use the following illustrations to review the elements you use on yourscreen to do work with your computer.MenusThe strip

170Appendix CMaking sure the RAM card is properly installedOnce you have completed the process for installing a RAM card, you cancheck to make sure th

Installing an expansion slot cardYou can install an expansion slot card in your PowerBook to add a port forexternal connections to the computer. One t

4 Use a small flat-blade screwdriver to remove the expansion port cover.The cover is held firmly in place by small tabs. You may need to pry it off by

5Slide the speaker grill (above the top row of keys) to the left and lift it out of thecomputer.The grill is held in place firmly and may require some

6Place your finger under the top edge of the keyboard and gently fold it forward so thatthe keyboard rests upside down on the lower part of the comput

7 Remove the six screws holding the metal heat shield in place. Then lift out the heatshield and set the shield and screws aside.Use a small Phillips

8 Locate the horizontal connector for the expansion slot card near the center of thecomputer.The connector is about one-half inch to the right of the

11 Align the card’s connector with the horizontal connector in the computer and gentlypush the card down until it is seated.If the two connectors don’

12 Replace the metal heat shield and fasten it in place with the screws.Slide the front edge of the heat shield under the case, then lower the back of

13 Replace the keyboard by folding it backward and lowering the top edge into place.179Installing Expansion Cards

IconsIcons are small pictures that represent disks, programs, documents, andfolders. You can double-click any icon to open it and see what it contains

14 Replace the speaker grill by lowering it into the opening above the top row of keys. Slidethe grill to the right to secure it.Position it so that t

15 Secure the card to the expansion port on the computer’s back panel by fastening the twoscrews supplied with the card into the holes in the port.Use

It’s a good idea to make backup copies of important software on floppy disksin case your hard disk or some of its contents is damaged. You can use the

184Appendix DMaking software disksThis section describes how to create floppy disks of the software that comeson your computer.Why make software disks

What you needJust as you need paper to make copies of important documents, you needfloppy disks to make copies of the information on your hard disk. Y

Making a set of disksTo make backup copies of system software, follow these steps.1 Locate the System Backup folder on the hard disk or the Disk Image

4 Follow the instructions on the screen until a message tells you that you’re finished. Insert a new disk whenever the screen messages tell you to. Do

6If you quit in the middle of the disk-making process and want to resume copying, clickResume Minimum or Resume Full (depending on the type of set you

3Click the icon for the folder you want to copy to select it.If you want to make one individual disk for a program (in case you lost a diskor an indiv

Control StripThe Control Strip gives you a quick and easy way to monitor and update yourPowerBook’s power management options and other useful features

Aaccent marks, typing 155–156active program 72, 73active window 18acute accent (´), typing 155ADB port. See Apple Desktop Bus(ADB) portadding memo

application programsApple Internet Connection Kit 3Apple IR File Exchange 3, 68Apple Telecom software 3, 44backing up 74Battery Recondition 3Clar

193IndexCcablesfor external monitors 50, 59safety instructions 145for SCSI connections 50, 51, 53, 107security 62cable terminators 51Caps Lock ke

Control Panels folder 117Control Strip 4, 19, 79, 80copyinginformation on a floppy disk 75information on a hard disk 74–75cumulative trauma disord

posture while using 141–144preparing to set up 8removable 31–34safety precautions 8, 82, 145–150storing 151error messages. See also troubleshooti

Control Panels 117Disk Images 188Extensions 117icon for 18PC Card Modem Files 43Preferences 117shared 112System Backup 183, 186Utilities 3fon

change in appearance of 98dimmed 73document 18Drive Setup 117folder 18Guide 17, 19, 20hard disk 18lightning bolt 80lightning bolt in battery

Mac OS Guide 20–23. See also Guide menu“Huh” button 23Index button 21Look For button 21tips for using 23Topics button 21–22troubleshooting and

using 42–45using Apple Remote Access with43–45PC Card Modem Files folder 43PC Card Modem icon 42PC Card slots 2, 37, 38, 39, 44PCMCIA card. See PC

MicrophoneO Contrast control¤ Brightness controlOn/off keyTrackpadTrackpad buttonBatteryExpansion bay(CD-ROM driveinstalled)Sleep indicatorSpeaker g

Using Mac OS Guide to get answers to your questionsWhen you have a question while working with your computer, you can get theanswer by choosing Mac OS

rebuilding the desktopMacintosh Easy Open control panelsand 97, 98method for 157troubleshooting 92recharging the battery 80–81reinitializing a har

SCSI terminators 50, 51security cable and lock 62security slots 2setting upbecoming familiar with equipment 1–7plugging in the computer 8–9prepar

system softwarebacking up 74, 183–189clean installation 129–130custom installation 131–135normal installation 121–128on PowerBook 1400 CD 118, 119

RAM card 170rebuilding desktop 92, 157reinstalling system software 120–135reset button 2, 25, 29restarting the computer 29, 92, 157right-angle br

Macintosh PowerBookUser’s ManualIncludes setup, troubleshooting, and important health-relatedinformation for Macintosh PowerBook 1400 series computer

K Apple Computer, Inc.© 1997 Apple Computer, Inc. All rights reserved. Under the copyright laws, this manual may not be copied, in whole or in part,

iiiCommunications regulation information viiPreface Welcome to PowerPC ixPart I1Getting Started 1Becoming familiar with your Macintosh

2Using Expansion Bay Modules and PC Cards 31Using expansion bay modules 31Using a CD in the CD-ROM drive 34Using PC Cards (PCMCIA cards)

vContents5Power Management 77Power sources 77Monitoring the battery charge 77Recharging the battery 80Removing or replacing the ba

Part IIIAppendix A Health, Safety, and Maintenance Tips 139Health-related information about computer use 139Important care and safety instru

3Notice the three buttons at the top of the window: Topics, Index, and Look For.Mac OS Guide gives you three ways of finding information:mTopicslets y

Communications regulation informationFCC statementThis equipment has been tested and found to comply with the limits for a Class B digital devicein ac

Industry Canada statementThis Class B device meets all requirements of the Canadian Interference-Causing equipmentregulations.Cet appareil numérique d

Congratulations on the purchase of your new Macintosh PowerBookcomputer. Your computer is designed to give you the highest performancecombined with re

IpartChapter 1 Getting StartedChapter 2 Using Expansion Bay Modules and PC CardsChapter 3 Connecting Additional Equipment and Changing BookCoversChapt

2Click “Customizing Your Computer” in the list of topics.When you click any topic area, a list of related questions appears on the rightside of the Ma

Tips for using Mac OS GuideHere are a few tips for using Mac OS Guide effectively:m Mac OS Guide is available only when you are in the Finder—thedeskt

Turning th e computer offAlways use one of the following methods to shut down the computer. If youdon’t, you risk losing any work you haven’t previou

Turning the c omputer off with the Shut Down commandYou can also turn your computer off by using the Shut Down command in theSpecial menu. Follow t

Putting the computer to sleepSleep is a power conservation feature of Macintosh PowerBook computers,reducing the amount of power the computer draws wh

m You can also put your computer to sleep by closing the display.When the computer is in sleep, a small green light flashes in the upper-rightcorner o

Automatic sleepIf you don’t use the computer for several minutes, it goes to sleepautomatically. This conserves battery power.To wake th e co mputer

2Click the Restart button.You can also do this to restart:mChoose Restart from the Special menu.If the Special menu does not appear in the menu bar, y

Software for mobility and efficiencyYour PowerBook comes with a variety of applications, utility programs, andcontrol panels that provide broad functi

31Read this chapter for informationon using expansion bay modules and PC Cards.Using expansion bay modulesThe floppy disk drive and the optional CD-RO

Removing an expansion bay moduleTo remove an expansion bay module from your Macintosh PowerBook, followthese steps:1 Quit any application programs or

5While holding the latch open, grasp the module by its gripping surface and pull it out ofthe computer.IMPORTANTYou should not remove an expansion bay

Inserting an expansion bay moduleFollow these steps to insert an expansion bay module:1Make sure the computer is in sleep or shut down.2Slide the modu

Inserting a discTo lo a d a compact disc in the drive, follow these steps:1 Start up the PowerBook, if it’s not already on.2Press the Open button to

Note: When the CD-ROM drive is in use, you may notice some vibration asthe compact disc spins rapidly. Certain discs can cause the drive to vibratebec

Using PC Cards (PCMCIA cards)PC Cards (also known as PCMCIA cards) are about the size of a thick creditcard and have a 68-pin connector at one end. Th

To i n s e r t a card, do this:mInsert the card, connector first and label up, into the slot. Make sure the card is level.A Type III PC Card must be

Yo u ’ ll feel some resistance as you slide the card in. When the card is firmlyseated, you hear a click. Use a smooth motion but don’t move the card

Control Strip for quick changesThe Control Strip appears on the desktop when you start up your PowerBookfor the first time. This strip lets you change

Other ways to eject a cardWhen the computer is turned on, you can also do any of the following:m Click the card’s icon to select it, pull down the Fil

If you can’t eject a cardIf you are unable to eject a card, follow these steps:1 Straighten one end of a paper clip.2 Insert the end of the straighten

Using a PC Card modemWhen you are using a PC Card modem, make sure you do the following:1Install the communications software you want to use.PC Card m

Using Apple Remote Access with a PC Card modemApple Remote Access uses modem files (sometimes called connection scriptsor CCLs) to get the best perfor

5Choose the port that your PC Card modem is in.You should see either the upper or lower PC Card slot listed. If you don’t,make sure your modem is prop

4Choose the type of PC Card modem you have in the pop-up menu on the upper left.5Choose the slot your modem is in from the pop-up menu on the upper ri

473Read this chapter for information onexpanding your computer systemwith additional hardware.The illustration below shows where equipment should be c

Additional information is provided in this chapter for adding the followingdevices to your computer system:m printersm external modemsm SCSI devicesm

Connecting an external modemYou can use a PC Card modem in your computer’s PC Card slot. Forinformation on connecting and using a PC Card modem, see t

The Guide menu contains online instructions for using Macintosh systemsoftware when the Finder is the active program. In addition to Mac OS Guideand t

Connecting SCSI devicesA SCSI device is any product—including hard disk drives, CD-ROM drives,and scanners—that communicates with your computer by mea

Where to add cable terminators when connecting a single SCSI device:Where to add cable terminators when connecting two or more SCSI devices:Using your

Connecting your computer as a hard diskBefore making any connections, you need to assign a unique SCSI ID number to the PowerBook. The unique ID numbe

53Connecting Additional Equipment and Changing BookCovers6Shut down the computer you are connecting to and turn off any other devices in theSCSI chain

11 Turn on the other SCSI devices in the chain, if any.12 Turn on the other computer.The PowerBook appears as a hard disk icon on the screen of the co

Simplifying the connection processIf you plan to use your Macintosh PowerBook regularly as a SCSI diskwith the same computer, you can leave the SCSI a

Quitting SCSI disk mode1Shut down the computer your PowerBook is connected to.2Press the Power (on/off) key once to turn the PowerBook off.Occasionall

Connecting an external monitorYour PowerBook has an expansion slot in which you can install an optionalvideo card for connecting an external monitor.A

3Place the monitor where you will be using it.Keep the computer and the monitor at least 8 inches apart. Interferencebetween the monitor and your comp

5Make sure the monitor cable is attached to the monitor. Then attach the other end of themonitor cable to the PowerBook’s video adapter.6Attach the vi

Where to find answersThe summary that follows indicates the type of information you can expect toget from each information source.On the computer’s ha

Working with an external monitorFor information on displaying the menu bar on the external monitor or usingan external monitor for presentations, see

Connecting sound input and output devicesYour computer has a built-in microphone. For information on using themicrophone to record sounds, see the “So

Connecting other devicesFor instructions on connecting a device not discussed in this chapter—forexample, an external input device (such as a mouse) o

Changing BookCovers on the computer’s caseYour Macintosh PowerBook comes with a removable panel, the BookCover,on the top of the case (behind the disp

2While holding the latch open by its downward-pointing hook, grasp the panel on the topwith your fingers and slide it toward you until it disengages f

Adding an insertFollow these steps to remove a panel and replace it with another panel.1 Remove the BookCover as described in the previous section.2Pl

2Make sure that the BookCover’s center tabs and the two shorter side tabs are allpositioned so that they will fit into the openings on the rear part o

Creating your own BookCover insertsIn addition to the set of printed inserts that came with the computer, you canuse the template on your hard disk to

Adding memory to your computerYour Macintosh PowerBook comes with at least 12 MB of RAM. You canincrease your computer’s memory by adding a RAM expans

Your PowerBook comes with some great software already installed thatincludes such features as:m hard disk password protectionm file exchange using the

In the printed materialsIn this book Use this book to set up and learn about your computer and foruseful tips and suggestions if you have problems whi

To get started with your software, follow these steps:1 Open the Macintosh HD icon (if necessary).A window similar to this appears.2Double-click the P

3When you’re finished, choose Quit from the File menu to leave PowerBook Highlights.IMPORTANTIf you delete the PowerBook Highlights icon, you have not

72Installing application programsYo u ’ ll probably want to buy and install additional application programs. Referto the manuals you receive with your

Finding out which programs are openIf you have several programs and windows open, you can find out whichprogram is active and which other programs are

Backing up your filesMaking backup copies of important files is good protection against possibledamage to the originals.Backing up and restoring syste

Tips for backing up all types of filesm You can back up an entire floppy disk by copying it to another floppy diskor to a hard disk.m You can use a co

Shared librariesNative programs use special files called shared libraries. These files help theprograms to run more efficiently and can be used by mor

Power sourcesYour computer can draw its operating power from two sources.mMain batteryYour computer came with a nickel-metal-hydride (NiMH)battery. Th

Responding to low-power messagesWhen the battery runs low, the computer displays a series of low-powermessages. The work time remaining after you see

IMPORTANTRecharge a depleted battery as soon as possible. Leaving adepleted battery in the computer for a length of time (especially in a hotlocation,

Preparing to set up the computerNow that you know some essential details about your PowerBook, you’reready to set it up and begin using it.To set up y

Recharging the batteryTo recharge the battery, plug in the power adapter. Do not use an externalrecharger designed for another Macintosh PowerBook mod

The correct power adapter for your PowerBook 1400 series computersupplies 45 watts of power (model number M4896). Adapters for oldermodels of the Powe

5Put the battery cap on the battery to protect the battery contacts.6If you are inserting another battery, remove the battery cap from the new battery

mElsewhereMany locations have government or Apple-sponsored collectionor recycling programs for spent batteries. Dispose of spent batteries inaccordan

IIpartChapter 6 Tips and TroubleshootingChapter 7 Diagnostic Techniques

When you have questionsIf you want to know how to do a particular task with your computer, refer toMac OS Guide in the Guide (h) menu. For instruction

Problems starting up the computerThe computer doesn’t start up.m The battery may need recharging. Plug the power cord into a workingoutlet and then pl

The computer makes an unusual sound at startup.m If you hear four tones, start up the computer with the Disk Tools disk thatcame with your computer. I

When you are ready to begin, follow these steps:1Plug one end of the power cord into the power adapter and the other end into a three-hole grounded ou

6. Open the System Folder, then open the Preferences folder.7. D r ag t h e Display Preferences icon to the Trash.8. Restart your computer without ho

When I start up the computer, I see a message about the system software.m The system software on the startup disk you’re using may be incomplete ordam

When the computer starts up, a message says there is not enough memory.m There may not be enough memory to load all the system softwareextensions you’

When the computer starts up, no icons appear in the windows, and the pointer alternatesbetween an arrow and a wristwatch, or an empty flashing box app

The computer exhibits odd behavior, such as many unexplained system failures.m Check for multiple System Folders on your startup disk, using the Find

A program won’t open.m The application program may already be open. Check the Applicationsmenu to see what programs are running.m There may not be eno

m If you get this message when you are trying to open or use a program,follow these steps:1. Choose About This Macintosh from the Apple (K) menu. Take

m If you know the correct program is on your hard disk, there may be aproblem with the information that the computer uses to keep track of files.Resta

Some icons look different from usual. m There may be a problem with the information that the computer uses tokeep track of files. Restart the computer

m If the file is on a floppy disk, the disk may be locked. Unlock the disk bysliding the tab so that it covers the hole at the corner of the disk.m Th