I could never get 7.0 or 7.1 installed on mine... It would freeze on boot up... I had to use the Silicon disk.. (RAM drive memory) since I had no external way of booting.. So I would install 7.0 or 7.1 on the silicon disk and after it failed to boot I would to flip back to the hard drive by taking out the pram battery to wipe out the silicon disk.. James what OS version are you running??