Macbook Pro Pinwheel of Death During 10.8 UpgradeMacbook Pro Pinwheel of Death During 10.8 Upgrade
What a disaster... If you see the pinwheel of death, aka the beachball of death, aka spinning ball, let it go for about 10 minutes. Still happeing? Hard shutdown by holding the power button for 5 seconds or so. It will shutdown. Press again to start up the Macbook Pro. The upgrade process should begin automatically.