Pc random sleep mode

Jul 16, 2008
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I'm having a problem with the pc I just built, the monitor goes into sleep mode randomly and I have to shut it down because it won't return. I've tried it on three different monitors and my tv through VGA, dvi and hdmi. It's an asus M4A78T-E motherboard with onboard video. I was thinking it was an issue with the onboard video but I don't have a video card to test it. Anybody ever encounter something like this? I've been searching everywhere for answers and asus tech support is ignoring me.
 
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