GIGABYTE EP35C-DS3R Black Screen Problem..

Hi,

After overclocked(tested stability and no problem),i got weird problem.
Sometimes(especially after restars) i am getting black screen after windows loading bar, before login screen.

After loading bar screen goes black and hdd works for a while then it stops working.
At this moment i have nothing to do and i must restart.Also i can't use sleep mode.It is causing endless restarts..

My spec:
Mobo: Gigabyte GA-EP35C-DS3R(rev 2.1)
Cpu: Intel E8400
Rams: 4x1 gb Kingston 1066

I'm now using my machine default and there isn't any problem.
I have to say that i won't buy gigabyte motherboard again ::mad :

Are you sure its a MB fault? If it is a MB fault, you could have had that bad luck with almost every brand - no one brand is immune. Maybe its video card or drivers problem. If its a nVidia card, there are quite a few people getting nVidia driver instability with screens going black etc. If you only did CPU stabilty test, it could be memory as well...

Hope you sort it out soon. Good luck.