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Contents

Important safety instructions .................... v

Laser compliance statement ..................... ix

Handling the ThinkPad computer ................. xi

ThinkPad don'ts . . . . . . . . . . . . . . . . . . . . . . . . . . . xi

ThinkPad do's . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii

Cleaning your computer ..................... xiii

Carrying your computer ..................... xiv

Extending the life of your computer's battery ......... xiv

Chapter 1. System overview . . . . . . . . . . . . . . . . . . . . 1

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Using your online user's guide .................... 7

Starting BIOS Setup Utility ...................... 8

Chapter 2. Protecting your computer ............. 11

Using passwords . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Power-on password . . . . . . . . . . . . . . . . . . . . . . . . 12

Screen saver password ..................... 12

Hard-disk passwords . . . . . . . . . . . . . . . . . . . . . . . 13

Windows password . . . . . . . . . . . . . . . . . . . . . . . . 13

Supervisor password . . . . . . . . . . . . . . . . . . . . . . . 14

Network password . . . . . . . . . . . . . . . . . . . . . . . . . 14

Passwords and standby mode .................. 14

Using the locks and the security screw .............. 15

Attaching the mechanical lock .................. 15

Using the security screw ..................... 15

Using the Asset RF ID feature ................... 16

Chapter 3. Solving computer problems ............ 17

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Error codes or messages .................... 18

No error codes or messages .................. 22

Power switch problem ...................... 22

Input problems . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Standby or hibernation problems ................ 25

LCD problems . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Battery problems . . . . . . . . . . . . . . . . . . . . . . . . . 30

Hard-disk-drive problems . . . . . . . . . . . . . . . . . . . . . 31

Software problems . . . . . . . . . . . . . . . . . . . . . . . . 32

IBM ThinkPad T21 User Guide

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