A mate just brought around a TMC mobo that "crashed" half way through a bios flash. He waited an hour but nothing changed and so he turned it off. It doesn't do anything now so I said to him it's probably toast, Yes?? unless you can get a new bios chip.
If the motherboard won't respond, and you can not find a bios chip to hot swap, contact the manufacturer of the board,... they will most likely sell you a new bios chip with the latest bios already programed on it. At least Abit and Asus will. (the cost is worth it!)
P.S. #1 rule of updating bios... Never turn off power during bios update.
you may still be able to reflash dont do the hotswap until all hope is lost....
99% of the time the boot block is NEVER updated.. try placing a old ISA video card and just a floppy drive nothing else. mkae a bootable diskette on another machine that will automatically flash the disk after bootup as you may not be able to use the keyboard. Flip it on and let it sit.. it may take up to 1/2 hour to boot up.. but it had never failed me i have flashed the completly wrong bios to something once and i got it back...
You should have what is called a BIOS jumper, and it will have 2 settings
2: Recovery Mode
You need to get a copy of the bios, or an older version of the bios, set the jumper to Recovery mode, pop the disk in with the bios on it, and boot up, you will get NO screen, just 1 beep to signafy that it is loading the bios, and 2 beeps when it is done, remove the floppy, shutdown, and put the jumper back to Normal mode. Now bootup.