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 4-2 lists the IRQ assignments.

Table 4-2. IRQ Assignment Defaults

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

Real-time clock

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 1-2 for the front-panel connectors and Figure 1-4 for the back-panel connectors on your system.

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Troubleshooting Your System

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Dell 2900 Checking the Equipment, Troubleshooting IRQ Assignment Conflicts, Troubleshooting External Connections, 116