I read an amptron (owned by PCChips) .pdf thing on flash failure earlier today, and it said something like it would take 3-4 minutes and then beep 4 times when done.
[edit]
I found it here ->
http://www.amptron.com/documents/Recover.pdf
"RECOVERING A CORRUPT AMI BOOTBLOCK BIOS
[snip]
NOTE: Make sure that the PC speaker inside your computer is working before you proceed.
When the BIOS has been restored your system will beep four times to let you know.
To restore an AMI BootBlock BIOS follow these steps:
1) Format a good working 1.44MB floppy diskette.
2) Copy a working BIOS ROM file for your motherboard onto the floppy disk. BIOS ROM
files can usually be downloaded from the motherboard manufacturer?s web site. If you
cannot locate a BIOS ROM file for your motherboard then call the motherboard
manufacturer for technical support.
3) Rename the BIOS ROM file ?AMIBOOT.ROM?
4) Turn the system on and insert the disk into drive A:
5) After about 3 ~ 4 minutes the system will beep four times. Remove the disk from the
drive. The computer will then restart.
At this point your BIOS should be restored and the system should startup normally..."