My PC won't turn on after touching the power cable on my PC

[Microsoft Windows]

My PC won't turn on after touching the power cable on my PC. I have seen that all the PSU plugs are plugged in with the motherboard. And the power adapter is well-connected to the power source. Also, the PSU is completely fine, but the PC is not turning on. But it turns on after a few hours or days. And accidental shaking of the power cable often causes such problems. Please help me to fix thas error.

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