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 | Reserved |
|
|
IRQ7 | Reserved |
|
|
IRQ8 | |
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
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.
3.Determine whether the system has an expansion card with a video output connector.
In this system configuration, the monitor cable should normally be connected to the connector on the expansion card, not to the system's integrated video connector.
To verify that the monitor is connected to the correct video connector, turn off the system and wait for 1 minute, then connect the monitor to the other video connector and turn the system on again.
4.Determine whether the system has monitors attached to both the front and rear video connectors.
The system supports only one monitor attached to either the front or rear video connector. When a monitor is connected to the front panel, the back- panel video, keyboard, and mouse connectors are disabled.
If two monitors are attached to the system, disconnect one monitor. If the problem is not resolved, continue to the next step.
5.If possible, run the appropriate online diagnostic test. See Using Server Administrator Diagnostics.
If the tests run successfully, the problem is not related to video hardware.
If the tests fail, see Getting Help.
