All of a sudden computer will not wake up from sleep

I am using windows 7 64 bit and I have a gtx 670. Everything was fine until after I was messing with bios settings in regards to cpu overclocking. I did not do any over clocking just changed some auto settings to manual. Now when I put my computer to sleep and when I wake it up, it turns on fine but there is no dvi signal. I went back into bios and changed it back to default but still no luck. Now everytime I have to restart if I put to sleep.
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More about sudden computer wake sleep
  1. is this a laptop? if No, then why would you be using sleep in the first place... it's pointless IMO

    clear CMOS to get BIOS back to factory
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