With the in the past year my mother purchased a used Powerbook G4. At first, the computer was exactly what she needed but slowly it started to decline into a nuisance. I am a Windows guy, so I dont know anything about Macs except for the fact that they are completely different. I guess Im just seeking help on how to do general maintenance. If I recall correctly, Macs do not require De-fragmentation but would a program like CCleaner be an advantage? Is there such a thing as a registry that needs repaired? The previous owner downloaded Torrents, could that be a danger to the system? How do I clean that up? I do not know the depths of her problems but here are some symptoms: During audio playback, through iTunes, the sound will cut out entirely or sound as if it is a skipping CD. Sometimes things will be randomly selected without interaction with the track pad. Example: If she is on youtube, or iPhoto, it could potentially pull up a different photo or youtube video entirely without even touching the track pad. She has difficulty with video playback through Youtube and even actual video files on her computer. It runs at snail speed; it is so slow it is obvious there is a problem. It has difficulty scrolling down web pages. Loading web pages can be very difficult As far as Im aware these are just some of her symptoms. Well, what can I do to diagnose the problem? I feel like it could be hardware related. I do not know where to begin other than to format the drive and then reinstall OSX. Also I have the upmost patience so if youre willing to hold my hand and walk me through the scary times of working with a Mac, Im willing to learn. Thanks guys for your time.