Hi guys, I don't know if I am supposed to post this thread here or under Mac OS X. I have a mid 2012 MBP non retina. It's been like a month that I noticed that it doesn't restart or shutdown and I have to force it to shutdown by pressing the power button. Now that there is the security update and I need to restart my MBP in order to install it I can't do it. Basically when I try to restart, desktop icons disappear and the mac stays on with the dock and the background on my display. It's not frozen as I can open applications from the dock normally. It's been like 6 months since I have installed a Samsung EVO 850 1TB ssd instead of the original HD and I don't know if it has something to do with this or if it's a software issue. I tried reseting PRAM and verified disk permissions but nothing works. I also started in safe mode but problem persists. Is there a way to figure out what causes this issue? Thanks in advance.