Quote:
Originally Posted by Albatross1991

With the information available I think your motherboard is malfunctioning.
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Why? He hasnt tested his HDD yet. HDD is a highly likely culprit. I'd try that in another system using your enclosure if at all possible. Also, contact HP, since it's a prebuilt it should be under warranty for 2 years after purchase.
:edit:
Other culprits could include but are not limited to:
SATA controller (so, in short, Mobo),
CMOS cache could be corrupt, (have you tried taking the battery out for about 10minutes and then popping it back in, clearing cmos, and restarting again?)
you might have a peripheral plugged in that is locking the system. Remove all external HDDs, USB keys, etc. Have only the bare essentials, ie. Monitor, keyboard, mouse. Not even speakers, cuz if you're using onboard sound and the sound cache is corrupt it could cause a lockup.
That's all I've got for now. Gotta get to work.