We had a short power outage, and when the power resumed, the fan in our iMac (intel core duo) was stuck on full speed. It sounded like a jet plane. I waited a minute or two for it to slow down, but it didn't stop. Even rebooting didn't affect it.

After some Internet searching, I found that there is a chip which controls the fans, which can get stuck like this. Fortunately it can be reset also.

Mac on Linux is a software package for Linux running on a PowerPC processor. It will allow you to run MacOS in a virtual machine.

It is similar in concept to VMWare GSX, where the disk images are stored in the host's file system but the guest VM screen is not tied to the host's screen.

Hardware

I'm running it on an old Power Computing PowerCurve Mac clone. It has been upgraded to a 225MHz PPC 604 CPU and 128MB ram.