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128 Troubleshooting Your System
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.
An unfamiliar constant scraping or
grinding sound when you access a drive.
See "Getting Help" on page 165.
The keyboard indicators. See "Troubleshooting the Keyboard" on
page 130.
The USB diskette drive activity indicator. See "Troubleshooting a USB Device" on
page 132.
The USB CD drive activity indicator. See "Troubleshooting a USB Device" on
page 132.
The CD drive activity indicator. See "Troubleshooting an Optical Drive"
on page 141.
The hard drive activity indicator. See "Troubleshooting a Hard Drive" on
page 142.
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)
Table 4-1. Start-Up Routine Indications
Look/listen for: Action