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System Crashing,reason unknown

Last response: in Systems
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Ok, I built my computer a couple weeks ago, and it began crashing (Not often) and now it is starting to crash a lot. I've checked the computer for viruses, I cleaned the registry, all to no avail. I'm thinking it may be an overheating problem, as after I didn't use it for a day, it took a long time to crash. Despite this, the graphics card is absolutely fine, running at the upper 30s, lower 40s idle. CPU is in the lower 20s idle. My specs:

ati radeon 5770 (Asus)
Phenom II tri core @ 3ghz
Asus m4a79xtd evo
4gb ddr3 ram Gskill
Logysis area 51 case
500w Psu apevia
Windows 7 64 bit home premium oem
Homebuilt system Master

Your PSU, although being big enough, is Apevia which can not be called a quality unit and therefore suspect. You description, did not use it for a day took long time to crash, points that direction since CPU and GPU temps are fine.
Homebuilt system Expert

Boot into safe mode, and check the event viewer for errors.
start-->run-->eventvwr.msc-->check the system and application logs for red X's.

Does it crash while in safe mode?
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