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8 Contents
Processor Expansion Module Board
(Service-Only Procedure)
. . . . . . . . . . . . . . . 139
Removing the PEM Board
. . . . . . . . . . . . . 139
Replacing the PEM Board
. . . . . . . . . . . . 140
4 Troubleshooting Your System . . . . . . . . 143
Safety First—For You and Your System . . . . . . . . 143
Start-Up Routine . . . . . . . . . . . . . . . . . . . . 143
Checking Basic Power Problems
. . . . . . . . . . . 144
Checking the Equipment
. . . . . . . . . . . . . . . . 144
Troubleshooting External Connections
. . . . . . 144
Troubleshooting the Video Subsystem
. . . . . . 145
Troubleshooting the Keyboard or Mouse
. . . . . 146
Troubleshooting Serial I/O Problems
. . . . . . . . . 148
Troubleshooting a Serial I/O Device
. . . . . . . 148
Troubleshooting a USB Device
. . . . . . . . . . 149
Troubleshooting a NIC
. . . . . . . . . . . . . . . . . 151
Troubleshooting a Wet System
. . . . . . . . . . . . . 152
Troubleshooting a Damaged System
. . . . . . . . . . 152
Troubleshooting the System Battery
. . . . . . . . . . 153
Troubleshooting Power Supplies
. . . . . . . . . . . 154
Troubleshooting System Cooling Problems
. . . . . . 155
Troubleshooting a Fan
. . . . . . . . . . . . . . 155
Troubleshooting System Memory
. . . . . . . . . . . 156
Troubleshooting an Optical Drive
. . . . . . . . . . . 158