Slight high-frequency beeping on a white background, e.g. Excel, Firefox?

Hello everyone, Recently, I've been noticing a faint, high-pitched beeping noise coming from my PC whenever I have a white page open in Firefox or Excel. The darker the page becomes, the less beeping I hear, or the less noise I hear at all. I had this problem years ago, but unfortunately I don't remember…

Whistling/beeping in the apartment?

Hello, I'm beginning to feel completely lost. I've been hearing a kind of beeping/whistling noise in my apartment. Apparently, it's such a peculiar sound that younger people in particular notice it. (No, not tinnitus, as it only occurs in the apartment.) It's there 24/7, but it's even louder at night, of course. Unfortunately, I can't…

Mouse beeping?

Hello! I don't know why, but yesterday I noticed that my mouse, when turned on, makes a high-frequency buzzing noise. It's not really audible, but I have relatively sensitive ears and can still hear it while working, which can sometimes be quite annoying. The noise is also there all the time, whether you move it…