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174 Solving Problems
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BIOS Recovery Utility
If your system loses power and beeps constantly but does not boot when
power is restored, the BIOS is probably corrupted. To restore the BIOS,
perform the following steps:
1 Disconnect the system from its power source.
2 Go to a different system that is working properly, and download the
BIOS flash executable utility for the system from the File Library
located on the Dell support website at http://support.dell.com.
3 On the working system, go to an MS-DOS prompt and type the
command
xxxxx -writehdrfile (where xxxxx is the name of the
BIOS flash executable utility you downloaded).
Running this utility generates a file with an .hdr extension.
4 Copy the .hdr file to a diskette.
5 Insert the diskette into the diskette drive of the corrupted system and
turn it on.
IRQ3 Used by serial port 2
IRQ4 Used by serial port 1
IRQ5 Available
IRQ6 Used by the diskette/tape drive controller
IRQ7 Used by the parallel port
IRQ8 Used by the real-time clock (RTC)
IRQ9 Used by the advanced configuration and power interface (ACPI)
IRQ10 Available
IRQ11 Used by the USB controllers
IRQ12 Used by the mouse port
IRQ13 Used by the math coprocessor (if applicable)
IRQ14 Used by the primary IDE controller
IRQ15 Used by the secondary IDE controller
Default IRQ Line Assignments
(continued)
IRQ Line Used/Available