The PC powers on after the second or third try

The mostly likely problem is that the power_ok (or power_good) sig­nal is sent before the power supply has stabilised. Get a better qual­ity PSU. In modern PCs, the power switch is a logic device that tells the PSU to supply full power to the motherboard. The power_ok sig­nal tells the motherboard that the power supply is available and stable. If the signal is sent too soon the motherboard does not rec­ognize it and stays off to protect itself. This can happen in lower-quality PSUs. Booting more than once is not recommended, and you will be better off getting a better PSU.

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