HT1338: OS X: Updating OS X and Mac App Store appsLearn about OS X: Updating OS X and Mac App Store apps
Currently Being ModeratedOct 17, 2012 9:44 AM (in response to sjf3)
Did it turn into a kalieidascope or is it the round spinning colorwheel? Have you tried to simply keep the power button down which would shutdown the system allowing you to boot back up?, or is it that everytime you try to bootup its the same issue? You may ultimately need to reinstall the system via the backup partition then do a Time Machine restore if you use Time Machine and if your system is pretty much modern.