lights

So every once in a while my 360 just decides not to work, and gives me the 3 quarters flashing red lights, now ive talked to xboxsupport and they explain this problem can be fixed for no fee if they determine thats what the problem is. So im guessing the 3 quarters red light is for one specific...

I got this yesterday, and I though my xbox was dead, but today while checking my xbox for how many lights were on (customer service request) and my xbox now works. Any clue as to what the problem could have been?