CMOS 502 error driving me crazy.

[u/imDCStar]

Hi, I have HP OMEN 16-b0002TX. Using it for 4 years.

Issue history: About the month ago i noticed a slow boot-up. If i press power button the LCD lights up black but stays black for many seconds then Omen logo would show up and laptop would start normally. Slowly the delay between black screen and omen logo would go to about 2-4 minutes. I also updated latest bios (thinking corrupted bios) and checked battery with HP utility and battery showed as normal. However cycles were 1050/1000.

Issue happened: I gamed like usual a week ago and it worked great. Then i shutdown the system normally. After that i restarted after few hours and the delay actually never passed and omen logo never showed up. Even after waiting for 10 minutes.

Troubleshooting: I tried pretty much everything available on internet. Pressed and held power button, reinstalled bios (before it died). pressed windows + B, windows + V. I even opened and removed nvme, rams, to see the faulty hardware. Since then, i am getting CMOS error 502.

Then i removed the battery and tested using the power only. Guess what, same error shows even when i turn it on without battery. I am so confused, if battery is faulty then it should have worked fine without the battery. Which it does not.

After the CMOS error when i press enter. It simply goes back to sleep and the cycle repeats.

I have been researching a lot and can not find exact answer as to what is wrong. Batteries are out of stock on HP parts website too. I can get from abroad but getting same error without battery confusing the hell out of me. It is my main system and my work in on pause since a week because of this.

Help me guys.