My ASUS M2N-SLI motherboard would not turn back on after running fine for 5 years. Connected a new (still in the box) 430W power supply - ATX 2.1 - the system powers on. The power supply doesn't have enough correct connections to use in this machine.
I shut down my other PC and took 1000W power supply from it and connected to ASUS MB - same issue - light is on, fans bump over then stop. I disconnected everything from the MB and tested - same result. I tried again with 430W PS - turns on. I then put the original PS from ASUS M2N into my other machine to verify bad and the light was on, fans bumped over, NO boot or beeps.
Then I put the 1000W PS back into my other machine and now it is doing the same - light is on, fans bump over, no boot and no beeps. Disconnected everything from MB - same result. I ordered a new PS but now I'm concerned that the bad PS may have damaged the MB and the MB may damage the PS so that plugging the new PS into either will kill it too.
Why does system boot with older version power supply but not newer? Could a motherboard kill a power supply? I know the power supply could kill the board, that's why I already ordered a new power supply.
Any ideas I might not have thought of? It's bad timing to have to replace two $1500 builds so I would appreciate helpful suggestions.