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http://support.dell.com/support/edocs/systems/ws53 0/en/ug/html/2swprob.htm#1164104

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:

Turn off the computer and disconnect it from its electrical outlet.

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.

Go to http://support.dell.com.

If this is your first time to use this website, complete the one-time registration.

Click Downloads for Your Dell.

Enter the Service Tag Number for the computer or select the appropriate Dell system.

Select the appropriate OS and language for the malfunctioning computer.

Select FlashBIOS Updates for the download category.

Click Go.

Follow the instructions on the screen to download the BIOS update utility.

NOTE: For some Dell systems, you are given a choice to create a diskette containing the BIOS update files or to download a file you can use from the hard drive. Select the choice to use the file that requires no installation mechanism, or application. This allows you to download a file that you can use from the hard drive.

Go to an MS-DOS prompt.

Change to the drive and file path where you downloaded the utility.

Type the command xxxxx -writehdrfile (where xxxxx is the name of the BIOS update executable file on the diskette) and press <Enter>.

This generates a file with an .hdr extension, and a message appears indicating that the .hdr file has been written.

Copy the .hdr file to a blank, formatted diskette.