Instructions
Remove the hard drive from your old Xbox 360 console. Turn off the console, unplug all the connected cords and stand it upright. Press down on the hard drive release button and then pull the hard drive up and off the console.
Connect the hard drive to your new Xbox 360 console. Attach the transfer cable to your Xbox 360 hard drive by inserting the large end of the cable onto the protruding connection on the hard drive and then plug the other end of the cable into a USB port on your new Xbox 360 and turn it on.
Copy your Xbox games. Select the "Yes, transfer to console" option when prompted, choose the "Games" category and select all the desired games and then press "Start" to begin the copy process.