I have a server that after 2 1/2 years of smooth operation does "nothing". No fans, no beeps.\nI've stripped the board down to the processor and fan, and out-of-the-case, grounding the front panel PWR-ON connector does nothing. Not even a short twitch of a fan.\n\nIf I ground PS-ON on the power connector, the fans do run, although I don't run the experiment very long since it's not really a clever thing to do.\n\nA spare power supply doesn't help. I don't have a spare processor, so I'm trying to figure out if it's the CPU or the M/B. SuperMicro tech support says a m/b, processor, and processor fan are all that's needed to get some activity.\n\nMy questions are, should the fans power up if the CPU is removed? How does the CPU control the PS-ON signal?\n\nI found a replacement m/b online and have it coming, but it would be much less work to fix the existing m/b (or processor) since all my licenses will need replacement, etc. I have a bare metal backup, so I'm not too worried about restoring data.