Things You'll Need
Instructions
Power off the Xbox and unplug any unnecessary devices attached to it.
Press down on the latch that is located on the front of the console. This will detach the hard drive. Lift up the hard drive for thirty seconds and then reattach it. This may help the console reset itself.
Turn on the Xbox again to see if the problem has been solved.
Insert a new game into the Xbox (newer than 2007). This will cause the hard drive to automatically update its software, which may be the cause of the Error 68.