7 Replies Latest reply: Dec 13, 2010 1:28 PM by Allan Eckert
Tohu Level 1 (90 points)
Hi everybody.

Sometimes, not always, when i switch on my Mac Pro, it starts up as normal until the log in screen should appear. At this moment the screen goes black.

I checked the connection and the display settings. Nothing. I then spot that setting the Mac Pro to sleep and waking up again solves the problem. The log in screen appears, everything is ok from then on.
So i think the display is not the problem. It is not in standby mode! I think the Mac or the OS sometimes doesn't recognize the display correctly and then send a black signal. But it must send a signal because otherwise the display would show this message that no input signal is present.

The display is from DELL, the connection is DVI. It is a Mid2010 Mac Pro Quad with AMD 5870 GPU.
Any ideas?

Mac OS X (10.6.5), Allways got the latest updates installed.