Question: My Mac Pro frozen after installing high sierra.
I managed to put the high sierra program on after a day and a half then I started downloading photos from iCloud which it completed and then old program OS maverick came on for a short time then white Screen froze with black bar and asking me to restart but when I do the same white screen with black bar comes on. Quit installation doesn’t work either. Ps advice help needdd computer of no use tomorrow Mon need to work on it. Thanks