If the board doesn't boot to the BIOS you are pretty much sunk. Your best bet is to try and reset the BIOS by removing the CMOS battery for about a minute or so and putting it back in. Some OEM boards have a built in battery and you have to find the CMOS or BIOS RESET jumper or it could be 2 small solder points you have to connect with a wire or something. To be honest, I've seen so many of those old OEM boards go bad they just aren't worth messing with. If it doesn't boot, there isn't much you can do.