Dell Optiplex 390 came in with a no boot complaint. Got diagnostic light 3 and blue power led followed by immediate shutdown. Did the usual diagnostic procedures: different ram, psu, fan, unplugged all non-essential connectors. After all this, and some google-fu, I came to the conclusion it was a bad motherboard. Got the new mobo in from Dell; same problem. Now banging head. Tried everything again, including putting the CPU in a different machine. Same conclusion; bad mobo number 2. While on the phone with the Dell tech, for some reason, I thought to try a different power button harness. Don't ask me why I thought to do this because I have absolutely no idea. Pulled a power button harness from another machine (Optiplex 3010 waiting in the lab for delivery to customer), plugged in the harness, damn thing booted right up. Dell tech couldn't believe it, engineer couldn't believe it. They are sending me another mobo and complete front panel assembly with all harnesses
9 сен 2024