Also when you first turn it on, does the fan on the power supply spin, even for just a bit? If it does it's an indication that the power supply itself is shutting down due to a self check failure. If the fan doesn't even try to spin it's more likely a problem with the power switch. In general this type of symptom is caused by something in the power circuit, which goes switch; motherboard; supply; motherboard. The first motherboard is the circuit to turn the supply on, which is always powered. The second is where the rest of the motherboard is turned on.
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