Checking the Equipment
This section provides troubleshooting procedures for external devices attached to the system, such as the monitor, keyboard, or mouse. Before you perform any of the procedures, see "Troubleshooting External Connections" on page 116.
Troubleshooting IRQ Assignment Conflicts
Most PCI devices can share an IRQ with another device, but they cannot use an IRQ simultaneously. To avoid this type of conflict, see the documentation for each PCI device for specific IRQ requirements. Table
Table
IRQ Line | Assignment |
|
|
IRQ0 | System timer |
IRQ1 | Keyboard controller |
IRQ2 | Interrupt controller 1 to enable IRQ8 through IRQ15 |
IRQ3 | Serial port 2 (COM2 and COM4) |
IRQ4 | Serial port 1 (COM1 and COM3) |
IRQ5 | Remote access controller |
IRQ6 | Diskette drive controller |
IRQ7 | Reserved |
IRQ8 | |
IRQ9 | ACPI functions (used for power management) |
IRQ10 | Available |
IRQ11 | Available |
IRQ12 | PS/2 mouse port unless the mouse is disabled through the System Setup program |
IRQ13 | Math coprocessor |
IRQ14 | IDE CD drive controller |
IRQ15 | Available |
|
|
Troubleshooting External Connections
Loose or improperly connected cables are the most likely source of problems for the system, monitor, and other peripherals (such as a printer, keyboard, mouse, or other external device). Ensure that all external cables are securely attached to the external connectors on your system. See Figure
116
Troubleshooting Your System