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New computer starts and instantly cuts off

Last response: in Systems
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July 22, 2010 5:48:59 PM

hello toms today i received my parts from newegg for my new build and when i put it all together the computer starts all the lights and fans start up than it cuts off within 2 seconds of cutting on. the only way to start it again is to switch the PSU off and back on than it dose the same thing again.

specs are
CPU AMD|ATH X2 7850 2.8G AM2
MEM 1Gx2|MUSHKIN DDRII800
HD 1T|WD 7K 32M SATA2 WD1001FALS
CPU COOL AC| ACALP64 PRO RT
DVD BURNER SAMSUNG | SH-S223L
PSU CM|RS500-PCARA3-US 500W RT
CASE CM|RC-534-KKN2-GP BK RT
MB GIGABYTE|GA-MA785GM-US2H RT
WIN HOME PREM 7 32-BIT


this is only my third bulid and i have never had any problems with the others so any troubleshooting will be greatly appreciated thank you for your time.
!