Has anyone else had a problem with your Mac booting up after installing the update to Yosemite? My MacBook automatically updated last night while I had it closed. This morning, I open it up and see the update has less than one minute left. That stayed like that for bout 10min. I restarted the MacBook and it would shut down after bout 5min of it loading up. Then, I restarted the MacBook in Safe Mode and after 3hrs, it is at this stage (see attached pic). Can anyone help me?