Hi people. Today at school I spotted a Macintosh Colour Classic that was not in use so I decided to go see the computer tecnition and ask kindly if I coulf keep it. He said yes so he gave me everything I needed, but there is one thing really bugging me. How do I change the desktop picture on it? Thanks. P.S. Is the mouse with it faulty? It will move left and right but doesn't seem to want to move up and down very easily. Any way to fix that or should I ask the tecnition for a different one? Thanks, James.