Hello. Every so often I hear weird chirping/cricket noises coming from inside the case, and I can't exactly pinpoint where it's originating from either. I had my ear near the hard drives, the PSU and the fans.. I still can't locate where it's coming from. Everything is clean and my drivers are up to date, also my hard drives were replaced recently.  This problem started yesterday.

Sidenote: I have a mini-fridge in my room and I had it on the same power surge protector, I noticed my monitor would go out just for a second every time the fridge's cooling kicked in, I recently moved the fridge and plugged it in else-where. Could this have caused the chirping noises? I've had the fridge and the computer on the same power surge protector since I bought it many many months ago.

Thank you for reading