Yes, I can turn off the laptop without any problem. I remember that when I installed Mavericks I followed the instructions to set AHCI to Manual. I did not do that during the install of Yosemite, maybe that is the reason that during install only the USB attached drives were shown and not the HDD and SSD!! Anyway Windows, Mavericks and Yosemite work fine with AHCI auto. I still have to find a solution for sleep, the funny thing is that sleep works in my Mavericks.