It shows every time I start up my laptop ( HP Pavilion 15 Gaming - Model no = 15-cx0056wm.
It says that there is no connection or something related, but when I set the boot option to legacy then the laptop boots completely fine.
But after one or two startups it shows the "The CMOS checksum is invalid and is going to be reset (502)" error.
I really don't know what's wrong.
One time my screen just went blank and showed the same 502 CMOS error when i was using the laptop.
Need Help ASAP! https://prnt.sc/26m6oaj
In a good computer shop or some Chemists shop, you might a CMOS battery. It's a small circular and about eighth of inch thick. It fits on the motherboard. Hopefully you can get access to the board. Laptops can be difficult to open up and if you haven't done it before, it's worth get a repairperson for PCs.