Hey dude, I dunno if you've shipped it out already or not, but it might be worth checking
this out. Basically it says this error message means the unit is having problems communicating with the DVD drive. Some things you can try are, opening your box and reseating the IDE cable that connects the drive to the mother board. You might even want to try replacing the cable. If that doesn't work, it means your DVD drive might be shot, which you're going to pay about $65 to replace. I'd say if you're still under warrenty, and you've already tried playing with the cable, then send it back to Microsoft. That way, if it's something worse than a shot drive, they'll be able to fix it.