I have an ibook G4 and my computer was acting very slow so I re-installed OS X. Although it looks as though everything has been erased (i had a lot of music) a sign comes up everytime I try to put pictures or music (or anything rather) onto my computer telling me my disk space is full, and when I look to find old space remnants i cannot find anything. I no long have the installation disks to try re-wiping out everything and starting all over. What can I do?