Table 4-1. Start-Up Routine Indications (continued)
Look/listen for:
The CD 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 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
Action
See "Troubleshooting an Optical Drive" on
page 143.
See "Troubleshooting a Hard Drive" on page 146.
See "Getting Help" on page 167.