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Contents 7
System Board . . . . . . . . . . . . . . . . . . . . . . 94
Removing the System Board
. . . . . . . . . . . . 94
Installing the System Board
. . . . . . . . . . . . 96
4 Troubleshooting Your System . . . . . . . . . 99
Safety First—For You and Your System . . . . . . . . . 99
Troubleshooting System Startup Failure
. . . . . . . . 99
Troubleshooting External Connections . . . . . . . . . 99
Troubleshooting the Video Subsystem
. . . . . . . . . 100
Troubleshooting a USB Device
. . . . . . . . . . . . . 100
Troubleshooting a Serial I/O Device . . . . . . . . . . 101
Troubleshooting a NIC
. . . . . . . . . . . . . . . . . . 101
Troubleshooting a Wet System
. . . . . . . . . . . . . 102
Troubleshooting a Damaged System . . . . . . . . . . 103
Troubleshooting the System Battery
. . . . . . . . . . . 104
Troubleshooting Power Supply
. . . . . . . . . . . . . 105
Troubleshooting System Cooling Problems . . . . . . . 105
Troubleshooting Cooling Fan
. . . . . . . . . . . . . . 106
Troubleshooting System Memory
. . . . . . . . . . . . 107
Troubleshooting an Internal USB Key . . . . . . . . . . 108
Troubleshooting an Optical Drive
. . . . . . . . . . . . 109
Troubleshooting a Tape Backup Unit
. . . . . . . . . . 110