Little more info. I just took the drive out of my other xbox (with the Xecuter 3 chip, has evox, avalaunch, etc.) and put it in the nonworking one. It gave an error 6 on the MS boot, and same black nothing on chip boot.
Try putting the chip in another one of your xbox's and press the eject and power at the same time to boot to the backup flashbios. Then flash the chip from that xbox, then after it's flashed move it back to your other box.
Its a soldered chip that I ordered. I dont have steady enough hands to do it. Was going to do the chip on my PS2 until I got it apart and saw what actually needed done. Heh. Ever used Xboxrepairguide (.com)? Was thinking of sending it off there.