[Update]
So I have a july 07 Zephyr, one of the first premiums to have HDMI.
now the GPU has pretty much failed completely, either no video signal at all or an extremely glitched out screen.
Sound works fine, go fuckin figure.
MS says that general video hardware failures are only covered for one year and won't repair it under warranty because its NOT an RROD even though my issue is caused by the exact same factors that produce the 3 rings.
Bastards!!
I think I'll call back and say that I have an RROD, they might replace it regardless.