Hopefully some Mac people visit this forum and they can help me out on this. I bought an iBook G4 (800 MHz and 640MB of RAM) back in November for my birthday, and I haven't had any problems until now. When I woke up this morning to turn it on, my computer has been running extremely slow. Programs take minutes to start up, I can't listen to my music on iTunes without the program stopping and/or freezing, and tasks just take minutes at a time to complete. Are there any diagnostics program I can run on it (are there any Mac programs like scandisk or disk defragmenter) or could this be a hardware issue?