MacPro 4.1 won't boot up, no power

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early 2009 macpro 4.1quad 2.93 ghz, 8 gb, 10.6.8
when turn off, won't boot. no light no power nothing. have unplug computer, remove cover, reset switches on motherboard, plug in, , startup. why? cause thiis?
 

dead power supply? easiest way know what's wrong take apple.
 


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