So my Late 2013 iMac started freezing today. The mouse will move, but I can't click on anything. Freaking me out. I am booting from an external SSD, but have been doing it for five or six months with no issues. I also added a USB hub I got from Amazon Prime Day just yesterday. Have since unplugged it and it still seems to be freezing. Troubleshooting what it is. I downloaded iStat. Are these normal temps for an iMac? Wondering if a fan is bad or something? Maybe dust. --- Post Merged, Jul 14, 2016 --- About 1300 rpm for the fan.