PC sometimes won’t boot.

Mar 3, 2018
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Hi everyone,
Recently, I am experiencing some problems with my pc. On a good day, I can instantly power on my pc. On a bad day, it takes a Long time just to power it up. Example of a bad day: Turn on power supply. Press the power on button. No reaction, fans not spinning, nothing at all. And one more thing, he date and time always changes. May I know what’s the problem ? TIA