Problem when starting up an iMac HELP!
(Sorry English is not my native language )
I need help, I have an Imac. And I'm having problems when i turn it on.
After the typical sound of the mac and the gray screen with the apple, it gets stuck. I can not enter into the system. Any idea?
Sometimes I also get a black square on the screen (look the picture).
Thank you for your help!
iMac, iOS 7.0.4