Computer won't start after losing power unless unplugged, BIOS resets date and time

lukiii

Prominent
Apr 19, 2017
2
0
510
Everytime the computer loses power, I have to unplug it several times in order to boot. Sometimes it starts after the first unplug, but other times the button lights up, the fans start working but the monitor displays "No signal" and I have to unplug it again in order to work.
Also, after it turns on, the BIOS always resets the date and time.
I'd like to know what could be the problem