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Troubleshooting Your System 129
Troubleshooting External Connections
Loose or improperly connected cables are the most likely source of problems
for the system, monitor, and other peripherals (such as a printer, keyboard,
mouse, or other external device). Ensure that all external cables are securely
attached to the external connectors on your system. See "Front Panel Features
and Indicators" on page 13 and "Back Panel Features and Indicators" on
page 19 for the front and back panel connectors on your system.
Troubleshooting the Video Subsystem
Problem
• Monitor is not working properly.
• Video memory is faulty.
Action
1
Check the system and power connections to the monitor.
2
Determine whether the system has an expansion card with a video output
connector.
IRQ5 Remote access controller
IRQ6 Diskette drive controller
IRQ7 Reserved
IRQ8 Real-time clock
IRQ9 ACPI functions (used for power management)
IRQ10 Available
IRQ11 Available
IRQ12 PS/2 mouse port unless the mouse is disabled through the System Setup
program
IRQ13 Math coprocessor
IRQ14 IDE CD drive controller
IRQ15 Available
Table 4-2. IRQ Assignment Defaults
IRQ Line Assignment