Checking The Equipment; Troubleshooting Irq Assignment Conflicts - Dell PowerEdge XK946 Hardware Owner's Manual

Table 4-1. Start-Up Routine Indications
Look/listen for:
An unfamiliar constant scraping or
grinding sound when you access a drive.
The keyboard indicators.
The USB diskette drive activity indicator. See "Troubleshooting a USB Device" on
The USB CD drive activity indicator.
The CD drive activity indicator.
The hard drive activity indicator.

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 129.

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)
128
Troubleshooting Your System
Action
See "Getting Help" on page 165.
See "Troubleshooting the Keyboard" on
page 130.
page 132.
See "Troubleshooting a USB Device" on
page 132.
See "Troubleshooting an Optical Drive"
on page 141.
See "Troubleshooting a Hard Drive" on
page 142.