Instructions
Reboot Xbox 360
Turn off the console and unplug the power cord from the back of the unit.
Remove the plug from the wall socket and disconnect the power supply unit from the power cord.
Reassemble the power supply unit and the power cord and insert the plug into the wall socket.
Connect the power cord to the console and turn it on.
Return to Microsoft
Click the "Start" button on your computer taskbar and open the Internet browser.
Navigate to the "Xbox Online Service Center" (see Resources) and click "Start a repair request."
Enter the required information into the repair request form and click the "Submit" button to complete the process. You will receive an email confirming your request and, if eligible, you will be sent an empty parcel in the mail.
Put your Xbox 360 in the parcel and return it to the supplied address.