Original post by: Mike

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I had the same exact problem with a gateway gt5670 desktop.  I replaced the motherboard and installed everything and the cpu fan and system fan would spin but no video or LED light. By the way it was my brothers pc I was working on.  Tried an external monitor and it detected nothing.  So i took out the cpu and found it had a bent pin.  Replaced it with and known working cpu and the pc powered and posted. Using it now.  Hope this helps.

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