I'm on an iBook G4 running OS X 10.4.11. It comes with about 50GB of hard drive space and 512MB of RAM. I bought it around 2006 or so. Also, I have no idea what the heck I'm talking about, so I hope you'll be patient with me. Issues: 1) It's been running extremely slowly, especially when Firefox is running. Rainbow pinwheels when switching between programs, when switching between tabs in Firefox, when opening new windows in Firefox or typing search terms into Google, etc. It runs faster immediately after I restart, but then will slow down after a few days of running the machine. (It also runs a little faster when my external drive (which holds my 19GB iTunes library) is disconnected.) After Googling a little, I saw people saying that slowness like this meant the hard drive was failing. I really hope this isn't true, because I can't afford a new one and don't have AppleCare. I repaired the Disk Permissions (for the first time since getting the computer; had no idea about it until tonight) since they were all out of whack, but haven't restarted since then so I'm not sure if it's helped or not. 2) Whole gigs of hard drive space disappear while I'm running the machine. I have very little hd space left (I need to get another external, I know), about 4GB, but it'll go down to 2 just in the course of using the computer for a few hours. The "missing" gigs come back when I restart the computer. (A bunch of files show up in the trash; most of them were Growl files. I've now uninstalled Growl, to see if that would help anything.) I Googled the missing hard drive space issue, and read somewhere that if you don't have a lot of disk space left, the virtual memory will write itself to your hard drive and will flush out when you restart. But a friend of mine has only 3 gigs of hd space on her MacBook and it runs just fine. But maybe it doesn't matter for her, because she has more memory? 3) My preferences are set so that the iBook should go to sleep after 15 minutes of inactivity, but it hasn't gone to sleep in... years. Only when I close the lid. Help?