Starting this morning when I use Safari and Chrome on my MacBook, the screen freezes. I am unable to click on anything, the dock does not magnify and if I try to force quit I have to use the keyboard only. The mouse moves but it will not accept any click at all. The only thing I have been able to do is shut down using the power button. Has anyone experienced something similar or maybe knows what is wrong? I have AppleCare+ and it is a summer 2012 MacBook Pro, non retina display.