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You have a Dell OptiPlex 3010, 7010, or 390. The motherboard is the (often labeled CN-0Y8H8Y or similar). You decided to move this motherboard into a standard ATX case to save money, or perhaps you are trying to diagnose a power button failure.
On a standard Intel motherboard, the power switch pins are usually and Pin 8 (Ground) . On the Dell MH61R, Pin 8 is NC (No Connection) .
Stop guessing. Start shorting. Good luck. Have a different Dell board like the 0Y2MRG or 0KWVT8? The pinout is usually identical, but always verify the ground plane with a multimeter before connecting.
On the Dell MH61R, the power switch circuit is on and Pin 7 (GND) .