I've been running Panther on my upgraded Bondi Blue iMac quite regularly. It currently has 512 MB of RAM, a MacWireless 11b USB Adapter, and a 40 GB 7200 rpm HD. However, after several hours of use, my iMac will sometimes sort of freeze. I have iTunes in the background quite often. But anyways, the symptoms are: 1) The clock will keep ticking. 2) Power to the keyboard and mouse die. Caps lock won't light up, the optical mouse is off. 3) The MacWireless 11b USB Adapter stays lit, until I unplug it and plug it back in. 4) Music will keep playing, but then it stops. However, I think that's because the Wireless Adapter turns off. I usually am listening to music off of my other computer through sharing or online radio. 5) The cursor is stuck. 6) Sometimes the cursor will start getting jumpy and jump from place to place for a few minutes before the above symptoms kick in. When I am in OS 9 there is no problem, and I measured my CPU temp to be 55°C using one of the OS 9 temperature apps since the thermometer doesn't work in OS X. I suspect, if there is overheating, is due to my 7200 rpm HD. The vents are quite noticeably hot ever since the upgrades. Any ideas? My HD is also partitioned into 3 pieces. One for the system, one for users, and one for apps.