Hello, I have a Mac Mini 2006 (Mac-F4208EC8). Some month ago I upgraded the machine with an Core 2 Duo, 4GB of RAM, a SSD and Yosemite. The Mac was running without Problems (except the lack of graphic acceleration) as an office computer till last week. Now I have strange Problems with the Fan.I have changed nothing but since last week the Fan isnt working anymore pretty much all the time. I tried to set the rpm with tools like smc and macs fan control - no result. I have resetted the PRAM - no result. Than I opened the Mini, disassembled till I reach the CPU. Than reassembled. Restart, and the Fan works. But after the next restart fan is not working anymore. What kind of problem could this be? Is this really a hardware failure which I can fix with a new fan? Or isnt it worth the new Fan, since there is probably a logicboard failure? Maybe there is someone with experience with the same problem, thank you!