Question Power up issue

Feb 18, 2020
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Hi, I just built my first PC, but Im having a couple of issues with it.

So I plug in my PC, than flip the switch on the power supply, the led on the motherboard comes on, but when I push the power sw on my PC nothing happens... When I jump start it via the motherboard everything starts up, but the power supply fan only stays on for a few seconds than stops but everything is still running, than when I push the power sw it turns off but it starts back up without me touching it.

PC Case: Phanteks Eclipse P 350x
Motherboard: Asus ROG Strix B450-F
Power Supply: Corsair RM650x