For those that have had issues with the fan speed on a Mac Mini 2,1 (late 2007?) model: If you have tried everything you can to resolve this, including an SMC reset, checking the fan plug inside, etc. --> it may be that you upgraded your memory from a single chip to two chips. I upgraded mine from 1 GB (standard) to 4 GB from OWC. Their memory is fine -- I think something happened in one of the many updates from Apple that caused my fan to run at around 5500 RPM whenever I scrolled in Safari or if the computer was taxed whatsoever. It was not a continuous fan running issue, but rather only when the computer was taxed. Also, it was not running hot - maybe 42 degrees C using SMCFanControl to check it. All I did today was remove the second memory chip, leaving in just the 2 GB chip, and now the fan is back to normal. I hope this helps someone else who is irritated to death by the noisy fan! If someone has found a solution other than removing the 2nd chip, please reply. I would very much like to put the other memory back. Thanks!