My secondary display flashes on and off
I have my secondary display connected (Apple Cinema 20 inch) using an active dvi adaptor. The display keeps flashing on and off. One moment I see my home screen and the other the screen is black. The backlight is stil on btw. It is not the display itself, the display is good and so is the power supply.
At first I tried all the basic stuff like rebooting, pulling the power cord out but none of those things worked. I have tried resetting the PRAM, but that did’t work. I also booted into safemode, and there the display worked just fine. I think it is an OS related problem and I don't know how to solve it, as there is almost no information about this problem.
I have also tried the scaling options for the display, and none of them work.
EDIT: I have added a screenshot. The screen is recognized and I can change all the options.
Any help is appreciated!
Thanks in advance!
Ist dies eine gute Frage?