OK your original problem was most likely that when you soldered the BT wire to the point behind the eject button it was hitting on the metal shield around it but jumpering the 2 points was not the right course of action !
Remove the BT wire from behind the eject button and re-test the xbox. Does the eject button work now ? if not remove the modchip and bt and d0 ... only leave the headerpin installed. and retest and report back here !
If the eject button works fine now then solder the BT wire to the alternate pont onthe bottom of the motherboard ( leave the area behind the eject button alone with nothing connected to it )
Here is the BT point for older motherboards !

Here is the BT point for V1.6 motherboards !

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www.HackDaBox.com HackDaBox !