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BIOS Recovery Utility
If your computer loses power and beeps constantly but does not boot when
power is restored, the BIOS settings may be corrupted. However, these
symptoms can be caused by several different problems. Before you restore
the BIOS, check the beep codes and diagnostic lights to see if a specific
problem is identified. Otherwise, perform the following steps to restore the
BIOS:
1 Turn off the computer and disconnect it from its electrical outlet.
2 Go to a different computer that is working properly, and download the
BIOS update utility for the computer from the Dell support website.
NOTE: After you download the BIOS update utility, generate the BIOS
recovery utility. To generate the recovery utility, you can use any
functioning computer. You do not have to use a computer of the same type
or model as the malfunctioning computer.
a Go to http://support.dell.com.
If this is your first time to use this website, complete the one-time
registration.
b Click Downloads for Your Dell.
c Enter the Service Tag Number for the computer or select the
appropriate Dell system.
d Select the appropriate OS and language for the malfunctioning
computer.
IRQ9 Available
IRQ10 Available
IRQ11 Available
IRQ12 Used by the mouse port
IRQ13 Used by the math coprocessor (if applicable)
IRQ14 Used by the primary/secondary IDE controller (if enabled)
IRQ15 Used by the primary/secondary IDE controller (if enabled)
Default IRQ Assignments
(continued)
IRQ Used/Available