My computer randomly shuts off.

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XkillerX

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I built my own computer and everything was fine. Then I decided to buy a new heatsink and new 120 mm fan to cool it down, because the cpu was hitting 75 C. So I got those, but now my computer seems to shut off on its own. Sometimes when I turn it on it starts to boot up, and then shuts off, or even when I'm in the middle of something it'll just turn off. I opened up the case to make sure everything was plugged in, and it seems fine. I have a 3.2 Ghz, x700 pro graphics, audigy 2 value sound, a dvd and cdrw drive, raptor 32 gig and seagate 200 gig, an abit AG8 mobo, and a 450 watt power supply.
 
it could be shutting off because its over heating.
you put some Arctic Silver on the HS?
 
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