Greetings,It sounds you've got standby power then, so the power supply is providing power to the board. Eliminate the possibility of a short. Pull the board out and try to short the power switch pins cardboard. Watch it carefully. Do you see a quarter turn of the CPU fan? Do you see a brief flicker? Does the motherboard lose standby power after you attempt to turn it on? Do you hear a click or sound from the power supply?
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