external display
I have been using my iMac for more than a year with a mini Displayport adapter to DVI and external monitor.
This morning it seemed fine until the external display started flashing and then slowly faded to grey/white completely and then black.
I went and purchased a brand new Samsung SyncMaster SA450 and connected it.
The display comes up and then goes off. When "on" the picture is grainy and distorted. Monitor will not stay sync'd.
Is it the mini DisplayPort adapter or the displayport itself?
iMac (24-inch Early 2008), Mac OS X (10.7.3)