Go here ->XBox Wizard.
Got any more specifics? like was it a transfer cable or a usb flashdrive? Does it boot up at all? unplug all the cords (wall to box, box to xbox) unplug the hard drive and make sure all the little brass connectors are clean and even spaces apart. Plug it all back in and see if it boots, if still nothing, unplug the hard drive and see if the xbox boots by itself. that's all I can wing at the moment, let me know if that did anything please
if you can access your dashboard then maybe try thishttp://www.360-hq.com/xbox-tutorials-62.html
What is most likely going on is a system update error. If it is not resolved by doing a manual update then it is an issue with a corrupted system firmware. Find the error code on this site that best matches what you get and follow the instructions given:http://support.xbox.com/en-US/xbox-360/t...
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