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Pc turns on for a few seconds

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Hello,

I just recently installed a new video card and ram. I used to have a 1 gb nvidia 520 and i recently upgraded to a amd 7770 saphire. im thinking maybe its the power supply but it cant be because it says 450 w for the graphics card and my power supply is 620 w?

OS: Windows 7 64 bit
Chassis: Cooler Master CM Storm Scout Mid towe
Motherboard: GIGABYTE GA-H61M-S2PV
Graphics Card: AMD 7770 HD Saphire
Processor: Intel Core i7 3770 CPU 3.4ghz
Memory: 8 gb
PSU: ATX 620W PSU

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when i put in the new graphics and ram it was working perfect for a couple of days, then all of a sudden it keeps trying to post then shuts down. :(  could it be the hs fan or the power supply?

when i put in the new graphics and ram it was working perfect for a couple of days, then all of a sudden it keeps trying to post then shuts down. :(  could it be the hs fan or the power supply?
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