Troubleshooting Your System 139
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 page14 and "Back-Panel Features and Indicators"
on page19 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
Swap the monitor with another working monitor to see if this resolves the
problem.
IRQ7 Reserved
IRQ8 Real-time clock
IRQ9 ACPI functions (used for power management)
IRQ10 Available
IRQ11 Available
IRQ12 Reserved
IRQ13 Math coprocessor
IRQ14 IDE CD drive controller
IRQ15 Available
Table 4-2. IRQ Assignment Defaults (continued)
IRQ Line Assignment