Well if done correctly with the proper files, there should not be a problem. If you try to rush through the process and do not know what you are doing it is very possible to screw it up. As far as fixing them, most of the time when an xbox requires service, there will be an error code in the corner of the screen, and there is a lot of threads on diagnosing error codes.
This post has been edited by re4de2ye0: Dec 8 2004, 05:35 AM