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I have a CrossOver 27"qd and used it with my old own built PC, however I'm trying to use it with my iMac 27 5K

I've got the mini displayport to dual link dvi adapter and a DVI-D cable, all new.

The issue is when i plug everything in I get connection and then a couple of seconds later it turns off then a couple of seconds later it turns back on (this is on a loop...) on then off, on then off, over and over.

When the screen comes on for the short time it dose, it does show the macOS desktop and when i check the mac system preferences for screen settings it tells me the monitor is attached.


Please help....
Tony