I've had my xbox since launch and did not buy the extended warrenty. My xbox gets a LOT of use, but I've never had a problem with it. The other day I turned it on and it would not recognize a single disc. It kept giving me a dirty disc error, even though I tried a brand new game and a few DVD's in perfect condition. It was also emitting a loud humming noise. I unplugged it from the wall and let it sit for the night. I tried it again today and was able to play Fifa, although it is still humming a bit. Is this something that I should be concerned about? Anybody else had this issue or heard of it happening to anyone else? Thanks!