In regards to davidgardner301 comment there is a extra step they. Didn't show on this replacement guide in order for your new disk drive to work you will need to remove the origional board connected to thje origional drive that came with the system and soler that onto the new one its a tricky process however its a step most people over look

Without the origional board the xbox will not accept the replacement drive only because each disk drive is coded to work with tat soecific xbox only so your out of luck if you already. Tossed out your old disk drive