PC Problem, Very rare, HELP!

Jun 11, 2018
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Ok so I have this problem, The pc I have keeps shutting down after 15 mins or so.
And it won't start up again, the fan rotates, the leds turn on but only for a sec, then it doesn't do anything. Cmos battery removal and reinsertion has no effect.

However, when I disconnect all components, and run it with only the cpu + mobo, it turns on, and when I reconnect other components and turn it on again, it turns on.
It turns on fine and can run for some time.
Once it ran for 10 hours straight, but now it ran only for 20 mins(I was playing NFS Payback).

If i disconnect and reconnect it will work again! What's the issue here? HELP!