Yesterday I had to stay out all day and I've just read your posts.
Thanks for your advice. What I'd like to do, before trying the RetiredChief method, is make sure the bleep is a bios bleep because I'm not 100% sure. The last time (a couple of months ago) I cleaned up the interior of my computer to remove dust the wire of the Cpu fan got disconnected by mistake so when I got to boot the computer I heard this "deep", sort of intimidating noise and the computer didn't boot successfully. I reconnected the wire and all was fine. This kind of bleep is more acute and lighter and way less "intimidating". Again, they're different from the bleep I always hear as the OS starts to load. Yesterday I didn't use at all the computer and today after I turned it on I heard the first bleeps after a while, today they were sort of wheezy/breathy (like the when a person runs out of voice after screaming too much).
Also for now I'm hearing the bleeps a lot less.
Couldn't it have something to do with the temperature monitor?
Don't you know of a place where I can find samples of those bleeps to see if they're close to those that I hear?