Desktop Operating Systems and Recovery

I’ve been intermittently having issues with my PC for a couple of weeks. It will randomly freeze up where I can't use the keyboard or mouse and I can't enter task manager, so I have to turn it off using the main power button. There doesn't seem to be a particular reason why this happens - it can occur at any time, for example when I’m using Microsoft word, browsing the web, or playing video games, so it doesn’t seem to be just down to stress on the processor. A green light usually appears when it happens (on the motherboard I think - see pic), but there have been times when it hasn't. I ran some hardware diagnostic tests as recommended by the HP website, all of which passed.

One time when this happened when I rebooted the PC, there was an error message saying the "The CMOS checksum is invalid. The CMOS will reset to the default configuration, and the computer will restart. Afterwards, please check the BIOS setup options to see if they change." I then proceeded to restart the computer, which failed to boot up several times, and when it did, I had to use a recovery key to get back in. I haven't checked the BIOS as per the error message, as I don't know what I am looking for. Any help would be appreciated.

freezesBitlocker recoveryError messageGreen lightNormal