I don't know if this problem is relevant to this section, but this is the closest one I can find to the issue.
Recently, I tried (not so successfully) to OC my CPU/Board. after It's didn't went so well I restarted my BIOS by jumpering and pulling out the battery and restored the parameters to their default. From this day and on I cannot work for long time with my PC, after 1-2 hours my screen became black and the monitor LED starts to blink rapidly, the PC continues to work but no video signal is out. After restarting I can't even see the bios screen - so it can't be windows/drivers issue. and only after shutting down the computer and waiting for 2 hours I can work again. I've two DVI outputs, one is connected to my monitor and the other to my TV. Sometime I can see work with my TV while my screen is dead. It's not a temp problem either (55C it's fine...). I took my graphic card for a check in the store, but they say It;s OK (the run it on 3dmarks for over 16,000min.)
I don't know what to do and I'm quite desperate from this situation, any help will be more than appreciated. my spec is detailed blow. sorry about the long story... Thanks, Amir