Error 12 is from the kernel reporting a DVD parameters problem.
Had this xbox for quite a while now, got a SmartXX chip in there with Evox M7 bios.
If you've been playing the xbox for a while you turn it off and turn it back on, it'll go to the SmartXX bios selection screen, fair enough, the eject button will refuse to work and when you select the bios the LED will FRAG and will display error 12.
Any quick fixes? Maybe a bios that doesn't require a DVD rom drive. Or even better, a solution to whatever's causing the problem.
Edited by Gazdaman, 14 February 2006 - 12:02 AM.