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68 Troubleshooting Your System
Checking Basic Power Problems
1
If the power indicator on the system front panel or power supply does not indicate that power is
available to the system, ensure that the power cable is securely connected to the power supply.
2
If the system is connected to a PDU or UPS, turn the PDU or UPS off and then on.
3
If the PDU or UPS is not receiving power, plug it into another electrical outlet. If it still is not receiving
power, try another PDU or UPS.
4
Reconnect the system to the electrical outlet and turn on the system.
5
If the system still is not working properly, see "Troubleshooting the Power Supply" on page 74.
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 69.
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.
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 Available
IRQ4 Serial port 1 (COM1 and COM3)
IRQ5 Available
IRQ6 Reserved
IRQ7 Reserved
IRQ8 Real-time clock
IRQ9 ACPI functions (used for power management)
IRQ10 Available
IRQ11 Available
IRQ12 Available