I just bought a 2013 iMac 27". I have an NEC 27" monitor that I've connected to the iMac with a MiniDisplay cable. It doesn't seem to work. When I restart the computer, it doesn't detect the NEC. If I unplug the cable, and plug it back in, the NEC display will show up. But if the iMac goes to sleep, or I have to restart, the NEC isn't detected.
Any ideas?
Any ideas?