No startup, only red light on logic board.
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?