I'm so pissed off man.
I can play DVDs or CDs but none of the games. I get this message saying... "Your XBox requires service. Please call the number on your manual for support". So I call and I get this rude bitch telling me that she has someone else registrated on the serial number from my XBox, and she told me that the warranty is only for 90 days and Microsoft charges 70 bucks for having it fixed.
I should have gotten a PS2... but of course I got an XBox for the same reason everybody got one... HALO!
Typical M$ nonsense. There's probably not a thing wrong with it. Try searching for info and/or posting about this on a gaming forum and I'll bet you find a solution. Good luck.