my 
mobo z77x-ud3h
gpu zotac 660ti
cpu i5 2500k
ram 4x2 8gb corsair vengeance 1600mhz
ssd corsair force gs 128mb + 250gb hdd
psu 700watt corsair gs
samsung 2232gw 22''
windows 7 ultimate 64bit
my pc working 4-5 months bf3 vs no problem and sudden time my screen black 

i res pc only black screen , i think bios crash or graphic card damaged 
i go gpu service for guaranty and i see gpu working , i try my gpu other old pci-e pc gpu working 
i try my pc ati 3600 series working 
now this problem?i update bios F16 and this problem continue , i now use onboard graphic card my pc
now bios f7 optimize default problem continue continue , i really bored 7 days moving pc services 
i cant install nvidia driver 
i see my mobo code A0 or AO i dont know 
