I have downloaded the DLC content for Forza 3, and when I encountered my past problems of corrupt data, I was able to go into the system settings and clear the cache, move the existing content to another drive so I can start again which went great - got all the content available until I move the data back to the hard drive..!
Moving the jalopnik pack back to the hard drive caused this to malfunction, and now everytime I turn the xbox on with the hard drive inside, the machine keeps re-booting itself. I have set the machine to not start reading the hard drive by placing a new profile on which does not connect through xbox live, nor does it read any data from the hard drive... this still does not work!
Any suggestions? I am using the newer xbox with a 250GB HDD & Kinect built in (currently unplugged for sense of ease).