Beep Beep Beep Beep Beep Beep!

There's a server in the server room (behind a closed door about 10 feet from me) that's beeping. It's been beeping since yesterday morning. It's quiet, on the limit of audibility, but it's there. I can just hear it if I put my headphones on without music playing. If music is playing I can't hear it. But as soon as my headphones come off, beep beep beep beep beep. It's slowly driving me insane. I've asked that something be done about it before I go insane, but it doesn't look like that'll happen until tomorrow. If it wasn't behind a locked door, I'd be in there with a screwdriver right now, shoving a wad of gum in the speaker.