Last night my PB G4 started popping up this Alert Disk Full message. It is telling me to delete some things off of my start up disk. I only had about 1gb free. I downloaded some software to tell me which files are the biggest and was able to delete over 13.5gb and it is still doing the same thing. It happens when I have more than one tab open in Fire Fox, or if I have more than one application open. It is getting super annoying. Any advice on how to fix it would be greatly appreciated. Thanks!