crwdns2934241:0crwdne2934241:0 mark ray

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No startup, only red light on logic board.

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I was told my power supply was bad so I replaced it and decided to upgrade the CPU from four to six core.

When I try to start it up no lights on the I/o board, no start-up sound. Nothing just the red led light as soon as I plug it in.

Tried a smc reset, zap pram, but nothing happens. The cpu was from a known working MP.  Short of tearing it down and replacing the original CPU back in any ideas, suggestions?

Thank you.

[image|2572381]

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Mac Pro Late 2013

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open