I just posted VERY detailed steps to updating your bios and my post
seems to have been lost in the Internet never never land, so here goes
a short version again:
I have same board, works great.
Use the built in bios updater called *Asus EZ Flash* (no need for a
boot disk, this is very easy) Check page 4-3 of manual if you want
more info.
Here is how it goes:
Rename bios downloaded from Asus to: P4C800ED.ROM and place this
file in the root directory of either a floppy (does not have to be
bootable) or a cd.
Now reboot system and during POST test (power on test) simply press
<Alt> + <F2> and the bios will begin looking for the bios file on the
floppy. If not found bios will look on the cd drive if setting in bios
allows it (if set). When file is found bios update will start and
complete and system will reboot with new bios update.
DO NOT interupt the bios update process or you may have boot failure on
next boot.
If all else fails just boot from the MB cd (original) and the bios will
update to one that your system was shipped with.
I'm running bios v1019 and it seem to be stable.
Good luck and hope this helps in any way,
P4-3Giger