First off, honestly, I did make an effort to find another thread on this before starting a new one. It seems most of the iBooks with heat issues are G4's and that's fairly common, even I know that. As it says in the subject line, I have a 900mhz G3 12" iBook with 640 mb of memory and 10.4.11. I *love* this little machine. It has been absolutely rock solid for the nearly 5 years I've owned it. I know I'll need to upgrade to a MB/MBP eventually but the reliability of this iBook has allowed me to put that off for a long time. Hopefully it'll hold out for a while longer and I can wait out a couple refreshes/upgrades/Rev. A's. Anyhow, the sturdiness of this iBook having been addressed, the last 4 months have left me reeling. I can no longer run processor intensive applications (iMovie, iSquint, Photoshop, Handbrake, VLC etc) for any useful length of time without the bottom left of the iBook becoming insanely hot and hearing what I assume is the hard drive going into this super hyper spin. The smell of plastic soon follows then I flip out and put Whopper the iBook to sleep for a while. Even when I'm running nothing but VLC to watch Doctor Who, 30 minutes into a 45 minute episode, I have to interrupt my viewing to cool down Whopper. Right now, all I'm doing is running Firefox to surf the web and the temp is 118 F (48 C). When running VLC, or iMovie, iSquint, Handbrake, something intensive, the temperature will reach 122-124 F (52-54 C) and the super spinning HD and plastic smell follow. It didn't use to be like this! Which is why I'm annoyed. Once upon a time, I could run iMovie for hours on end. I could leave iSquint running all night to convert movies to high quality .mp4 format or use Handbrake to rip dvd's all. day. long. I have run disk utility, repaired permissions and S.M.A.R.T status is verified. I booted in safe mode and that checked out ok too. I have noticed that my iBook runs about 10 degrees cooler on battery power than when powered by the AC adapter. Does that mean anything? Is this just part of the aging process and I need to go buy a cooling pad or is this the very beginning of a catastrophic meltdown? Feel free to say "well duh" at any of these observations. I can repair G3 iMacs with ease, but these notebooks make me crazy with all the screws and itty bitty parts. Fortunately I have a really good Mac repair guy in Greensboro but I don't want to bother him until I know I've exhausted all do-it-myself options. Thanks for any insight!! This problem has crippled my productivity and I'm frustrated beyond belief.