Bios update incorrect for Asus P4SGX-MX

I have recently updated a wrong version of bios for the above, but now are unable to switch on the computer at all. There is a series of beeps when power is switched on.
I updated bios mainly because I brought a 200GB hard drive (Maxtor), but have been unable to format or install Window on it.
Could someone please provide me with some help, as external technical advice seems to reside around changing my hardware.