I went to turn my console on today after a couple days of being gone and it made a really loud vibrating sound. It sounded as if a controller had turned on for a second and started vibrating on a hard surface. It wasn't a humming or anything, just a loud short vibrating sound. I turned it off, then back one and it did it again. I turned it off again, and haven't touched it yet because I don't want to break it. I read that it may be because there was no disc in the disc drive, but I don't want to test that. This xbox is about a year and a half old so far... I had to send my first one in due to rrod, and they sent me a new/refurbished one. It is the original Xbox 360 by the way. Any help would be greatly appreciated.