Table 4-1. Start-Up Routine Indications (continued)

Look/listen for:

Action

 

 

The CD drive activity indicator.

See "Troubleshooting an Optical Drive" on

 

page 143.

The hard-drive activity indicator.

An unfamiliar constant scraping or grinding sound when you access a drive.

See "Troubleshooting a Hard Drive" on page 146.

See "Getting Help" on page 167.

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 131.

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

130

Troubleshooting Your System

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Dell DL2000 owner manual Checking the Equipment, Troubleshooting IRQ Assignment Conflicts, 130