Constant beeping noise & CMOS reset error (502)

[Lois_Booker]

I'm getting a CMOS reset error (502) when my laptop boots successfully, and most of the time it just shuts down immediately.

Pressing the power button for 3 seconds while holding 'Win+v' or 'Win+b' doesn't do anything.

If a dead CMOS battery is the problem, my friend told me that my laptop doesn't have a CMOS battery, how do I know which battery it is using and how do I know if the battery is the problem?

The corrupted BIOS doesn't seem to be corrupted because I can still change the settings, how do I know if it's corrupted then? and I just updated it to the latest version but the problem still persists.

How do I know if it's a faulty hardware? Before this happened, I solved the System Fan (90b) error by replacing the system fan on the right side, but since then I've mostly been hearing a constant beeping noise in my laptop, is this related to the CMOS reset error (502)? My first suspicion was that the hard drive was making the noise, but it doesn't sound like a clicking sound.

[Lois_Booker]

BTW, I just read that LethalWhite has the same CMOS problem as mine, but mine doesn't BSOD and doesn't freeze.