This has happened three times now. two in the last two days. The computer shuts down like a power loss and in the morning i have to start up the system all over again. I don't think twice like that would the electric shut off so i am wondering if this is the motherboard or the pcu issue and how i can tell. Right now its working ok. At first i thought i had lost power yesterday. around 1:00 Am. last night it shut down at a couple of minutes after 12:00Am. We didn't have any storms here and i don't think we would have lost electric two days in a row and if the electric does go off The a/c fan would stop and that always wakes me up. Is there a way to test the pcu to eliminate that as a issue? I don't have much testing equipment other than a digital voltage meter. Not sure if that is useful or not. Any ideas?? Can the motherboard do that??