Table 4-2. IRQ Assignment Defaults (continued)

IRQ Line

Assignment

 

 

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

 

 

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 14 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

1Check the system and power connections to the monitor.

2Swap the monitor with another working monitor to see if this resolves the problem.

Troubleshooting Your System

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Dell R805 owner manual Troubleshooting External Connections, Troubleshooting the Video Subsystem, 139