no post, can’t boot up. reset the RTC RAM in CMOS?

If you are a computer man, you might know reset the CMOS RAM
This jumper allows you to clear the Real Time Clock (RTC) RAM in CMOS.
To erase the RTC RAM:
CLRTC jumper

many computer back to working after you reset the RTC RAM,
But why?
The problem is from power supply unit (PSU).
Changing a better PSU is real solution.

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