Is my screen display dead?
Suddendly, when retourning from sleep, my imac shows a grey/black background with some vertical lines in the center. iMac running ok (I can see it with a second monitor) but showing nothing through its display... Any idea of what is happening? What's broken down? And, after that, how much could cost to repair it?
(NVRAM reset already done)
Is this a good question?