Mac Mini 3,1 fan 0 rpm after I install SSD
I encountered a very odd problem recently while trying to upgrade my mothers Mac Mini. I wanted to install a SSD drive and first purchased a Crucial M4 128 GB. Following the excellent manual provided on this website it took me just 15min to do so. Mac OS installed perfectly but the Mini would always shut down while installing Windows 7 via Boot Camp. Thinking this was an issue with the Crucial SSD, I exchanged it for a Samsung 840. The installation of Windows 7 worked, but once I wanted to install drivers, the Mini shut down again.
I discovered that when the SSD is in the Mini, the fan won't work and the sensor correctly reads 0 rpm. Bootcamp seems to have a higher cpu load so that it shuts down quicker. When I did a quick stress test in Mac OS, the mini would shut down after a few minutes too. (Apple Hardware Test (AHT) also tells me that the Fan Motor does not work)
Now comes the strange part. First I assumed I broke a cable or the temp sensor (although I used extreme caution and would describe myself as experienced with these kind of tasks).
However, when I reinstall the old 160GB HDD, the Fan will work perfectly, without any errors in AHT.
Does anyone have a clue why the fan spins normally with the original HDD installed and won't even start with 2 different SSDs? I want my mom to profit from the superior SSD speed, but when the fan simply won't work, this is not an option.
Kind regards from Germany,