Checking The Equipment; Troubleshooting Irq Assignment Conflicts - Dell PowerEdge NM176 Hardware Owner's Manual

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

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 99.

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
Available
IRQ3
IRQ4 Serial port 1 (COM1 and COM3)
Available
IRQ5
98
Troubleshooting Your System
Action
See "Troubleshooting a USB Device" on
page 102.
page 102.
See "Troubleshooting an Optical Drive" on
page 110.
See "Troubleshooting a Hard Drive" on
page 111.
See "Getting Help" on page 127
.