random PC beeping

[Armakar]

Month old PC build. Has had issues with complete freezing (cant even press the reset button) and now it's started to beep. Just a single beep every hour or so, sometimes more frequently. No temperature issues, no lag at all ( apart from the complete freezes when I have to restart my pc ). No unexpected performance etc, what's the problem, any ideas?

 

 

I ran Memtest86 but after 6+ hours of running it, the test repeated itself and said no issues found. I'm assuming thats fine, but i've never used memtest86 before, so not sure.

 

edit : Nothing to do with my overclocking, I undid all the overclocking and still had this problem.

Thanks!