As you have the "keep alive" power on the motherboard, indicated by the orange LED, the power supply is working somewhat. Disconnect the 24 pin power connector from the motherboard. Then jumper the GREEN wire to a BLACK wire and see if the power turns on (fan will run). If it does this, it doesn't say the power supply is good (only replacing it with a known good power supply is the only real test for a power supply) but it does say the problem turning on is not in the power supply. If it does not turn on, the power supply is the likely problem.
If the power supply turns on the next most probable problem is the motherboard. reseat (unplug and plug back in) the front panel connector on the motherboard and then give it a try. If it still will not work, the motherboard is suspect. The power switch, itself, would be a very remote problem.
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