A friend was recently given a 2019 iMac, apparently as a gift. Turns out it was actually a 2007. My friend needs an appropriate OS. I still have snow leopard on my 2007. What OS will work on her 2007 ...
I just replaced the hard drive on my 2008 24-inch iMac (model 8,1) with an SSD. I am running OS 10.6.8. Now AFTER Shutdown or in Sleep mode, I can hear a fan still spinning along with a quiet clicking ...