is your CPU the 965 black edition? if so check the wattage on the board, most newer boards don't feed it enough juice.
although they announce the black edition is 125 watts its actually more like 140watts
some boards will still allow the cpu to run at a lesser efficiency while others don't work at all
I know the m4a78 supports the black edition and the m5a78 deluxe will run it though bios tells me cpu wants more power. and I returned an ASrock that didn't power it up at all