PC randomly doesnt want to boot up

[Secre7Agen7X9]

Hello. This has been a problem for a while. But it has went away for almost 6 months and started doing it again today. So what happens is my pc will be working fine one day and the next day it wont power up at all. Now when it powers up is random. I could press the button a thousand times and it wont do anything only to try again an hour and it will boot right up. Sometimes its an hour. Maybe a day. maybe a week. But like i stated before its stopped for almost 6 months and just started doing it again today. Also when it boots up it sometimes says "Main BIOs corrupted" and goes back to a later date or something. A few times its just booted up.

PC Specs
Gigabyte Gtx 750 ti GPU
Motherboard :GIGABYTE GA-Z77-HD3
16gbRam
500Gb HDD
PSU EVGA 600w bronz

 

[Ztdutxjgxgtu]

Try replacing the mercury battery on mobo.

Imo, mobo is getting quite old, switches worn out. Weather Etc.

The worse case to fix it may be not turn off pc

 

[Secre7Agen7X9]

Try replacing the mercury battery on mobo.

Imo, mobo is getting quite old, switches worn out. Weather Etc.

The worse case to fix it may be not turn off pc

Already replaced cmos battery. Hope the mobo isnt junking out.