Last Semester I sent my xbox in because it would freeze after one game of multiplayer in halo1. i got it back and it worked fine until now. i havent modded my xbox at all whatsoever, but am now getting error 21. i dont really know much about xbox's, just that those mother f-ers want 80$ to fix this error. any suggestions? keep in mind i am a super amateur at this kind of stuff.
I think that is when the dvd drive is not pluged in. Just open it and make sure that everything is pluged in. If thats not it I have no idea.
I wouldn't advise you to open it. I would send it back. More than likely, it can't make a connection to a dashboard or something like that. If the harddrive wasn't responding, it would give like a code 7 or something like that.