POST Error A0

Hello I have been having some trouble with my system for a while now.Whenever I restart my computer the screen goes black and I get the A0 error on my motherboard. I can turn my pc off and then on just fine but cant reboot. I also get A0 when i exit the BIOS. I have a evga 780i and a Q6600 that I have overclocked to 3.4(Air). The A0 does not happen at 3.2 so s this caused by the high overclock? does it mean my system is not stable? I have not had any problems with it for the past several months other than this A0 thing. Maybe it is a BIOS settings thing? such as voltage. Could someone suggest me the appropriate voltages for this overclock. I also can not go higher than 3.4 as I get the A0 turning the pc on.

My system:
evga 780i
Q6600 (GO Stepping) @ 3.4
4gb Corsair XMS2 @850
evga GTX 280

Thank you in advance.

If you have (or download) OCCT and run blend test.

You will find out if the system is stable, plus it monitors temps, plus it will give you a file of graphs for temps and voltages. If it passes look at the voltage charts for voltage ripples that can give you an idea if you may be having PSU problems. I'd start at 3.2 Ghz, since you don't get the error at that speed.