download xboxhdm and use a backup of your eeprom to unlock and rebuild your hard drive. also make sure in future you use nkpatcher with a virtual C partition and a virtual EEPROM to avoid screwing things up. if you haven't backed up your eeprom than that's your own fault and you'll have to hotswap.
as for the black and white, that is because it is outputting in a format your TV does no support, if you live in the US its most likely PAL.
the majority of games will play fine in the other video mode (NTSC to PAL and vice versa) but several games will only play in the video mode corresponding to the region it was developed for.
many dumbasses think enigmah will solve all their problems but it doesn't as its not a case of it not switching correctly, it is forceably switching to its native mode and the TV simply does not support it.
either acquire an NTSC copy of the game, get a TV that supports NTSC and PAL, or search for a Jade Empire region patch and get lucky

other than that nothing more can be done.