8Contents
Control Panel Assembly (Service-only
Procedure) . . . . . . . . . . . . . . . . . . . . . . . . 131
Removing the Control Panel Assembly. . . . . . . 131
Installing the Control Panel Assembly . . . . . . . 133
System Board (Service-only Procedure) . . . . . . . . 133
Removing the System Board . . . . . . . . . . . . 133
Installing the System Board . . . . . . . . . . . . 136
4 Troubleshooting Your System . . . . . . . . 137
Safety First—For You and Your System . . . . . . . . . 137
Start-Up Routine . . . . . . . . . . . . . . . . . . . . . 137
Checking the Equipment. . . . . . . . . . . . . . . . . 138
Troubleshooting IRQ Assignment Conflicts . . . . 138
Troubleshooting External Connections. . . . . . . 139
Troubleshooting the Video Subsystem. . . . . . . 139
Troubleshooting the Keyboard . . . . . . . . . . . 140
Troubleshooting the Mouse . . . . . . . . . . . . 141
Troubleshooting Basic I/O Functions . . . . . . . . . . 141
Troubleshooting a Serial I/O Device . . . . . . . . 142
Troubleshooting a USB Device. . . . . . . . . . . 143
Troubleshooting a NIC. . . . . . . . . . . . . . . . . . 143
Troubleshooting a Wet System . . . . . . . . . . . . . 144
Troubleshooting a Damaged System . . . . . . . . . . 146
Troubleshooting the System Battery . . . . . . . . . . 147
Troubleshooting Power Supplies . . . . . . . . . . . . 147