I have a 1.6b xbox with the apple x-vi pro mod chip. I can load the normal mode but when I attempt to load the modded mode the screen is black and nothing visisble happens. However the cd drive starts to run and the fan turns on. the front light is green when this happens. I believe my chip had been pre flassed but I am not sure. would these symptoms be consistent with an unflashed chip? Any help would be appreciated.