i had that problem twice and RMA that board back to newegg,
believe me , I had so much mess with this A7n8X that I have changed 4 mobo in 2 months!! ;o(
the bios just won't beep but everything runs,
even though I changed the battery, reset the jumper to clear the CMOS
what revision you were using??
coz I know after flashing the bios to at leas 1002a,
that, if I screw up anything on the settings, it can be cleared,
for all bios from
1001 c,d,e are really flaky bios... and can crash anytime when you oc
even for the dumbest reason like changing from fsb 133 to 166 sigh....
new revisions onwards are alot better though ;o)
I myself using the PCB 2.0 right now ( which is my 4th A7N8X board)