Hello,
When I boot up this happens:
A black square center bottom of the gray screen
It won't let me use my Mac.
MacBook Pro with Retina display, OS X Mavericks (10.9.1)
Posted on Jun 12, 2014 6:22 AM
Q: Black square in bootup
Are you able to start up in Safe Mode?
This is during a restart?
Startup Issues - Resolve
Startup Issues - Resolve (2)