windows self reboot on mac pro late 2013
I installed windows 10 on a mac pro late 2013. I found the ISO image on a windows site. The installation procedure did not ask me for a usb key (though i had it available). I did not activate windows, as it is not required according e.g. to this site http://www.windowscentral.com/you-do-not-need-activate-windows-10.
Apparently everything went well, devices are working. At the beginning i did not install external software and for the first two days everything seemed to work. Then i installed dropbox and firefox and when reproducing some video in streaming i had errors like 'the amd driver crashed, it has been restarted'. I then removed firefox and installed chrome, yestarday evening everything seemed to work correctly. Anyway, when i tried to shut down the computer the screen was deactivated but the mac did not shut off, i had to shut off by the physical button. This morning the computer rebooted itself (not on my request) many times, one time the reboot was preceded by a loud noise produced by the mac. Still i have the problem with shutdown that deactivates the dispaly but doesn't complete the operation.
My mac pro has already had problems with mac os, which i described in this thread https://discussions.apple.com/thread/7045057, i sent it two times to apple service with no result. I installed windows in the hope this would have a better behavior, but actually it's worse.
Mac Pro (Late 2013), OS X El Capitan (10.11), bootcamp windows 10