If you can enter the BIOS then it's not as bad.
1 -- After a Clear CMOS:
BIOS:
F5 to Load Defaults
Set the Date & Time
/other BIOS settings as needed i.e. SATA -> AHCI if used
F10 to Save & Exit = Yes
2 -- Proper Clear CMOS Procedure:
Your MOBO has a Clear CMOS button @ the rear of the MOBO's I/O next to the purple PS/2. Most folks don't Clear the CMOS properly, Unplug the PSU for ~5 minutes, Press and Hold the Clear CMOS button for 5~10 seconds then let go, plug in the PSU. See ->
http://www.youtube.com/watch?v=rdHH9KrceR0
BIOS:
F5 to Load Defaults
Set the Date & Time
Set the Date & Time
/other BIOS settings as needed i.e. SATA -> AHCI if used
F10 to Save & Exit = Yes
3 -- Updating the BIOS -- only use ASUS EZ Flash 2!!!:
Only use ASUS EZ Flash 2, using a FAT32 Flash Drive unzip and extract the (.ROM) file, use only black USB 2.0 ports, press ALT + F2 (if needed the F Lock key), and update the BIOS. See ->
http://www.tomshardware.com/forum/289507-30-what-flash
4 -- BIOS Recovery:
If your BIOS is toast and you cannot enter the BIOS:
ASUS CrashFree BIOS 3 -
http://www.youtube.com/watch?v=LirQ-oM9XBI
RENAME BIOS = P6X58DE.ROM
<or> use the ASUS DVD that came with the MOBO it already has the shipping BIOS on it.