Dell PowerEdge 2970 Hardware Owner's Manual - Page 116

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 116. 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 IRQ0 IRQ1 IRQ2 IRQ3 IRQ4 IRQ5 IRQ6 IRQ7 IRQ8 IRQ9 IRQ10 IRQ11 IRQ12 IRQ13 IRQ14 IRQ15 Assignment System timer Keyboard controller Interrupt controller 1 to enable IRQ8 through IRQ15 Serial port 2 (COM2 and COM4) Serial port 1 (COM1 and COM3) Remote access controller Diskette drive controller Reserved Real-time clock ACPI functions (used for power management) Available Available Available Math coprocessor IDE CD drive controller 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 13 and "Back-Panel Features and Indicators" on page 17 for the front- and back-panel connectors on your system. 116 Troubleshooting Your System