I have a brand new Mac Mini, arrived October 10, 2013. I also have a NEC MultiSync LCD2490WUXi display connected via the HDMI to DVI adapter. Version 10.8.5 is installed with software updates just run. Booting up, or coming out of sleep, the screen looks normal for about 2 seconds. Then the screen goes black (no video signal) for about 2 seconds. Then the screen is displayed normally. After this, the computer runs with no problems. I have contacted Apple Support but they do not know the cause of this screen blanking. Nor do they think this is something to worry about. Has anyone else experienced this momentary screen blanking? And does anyone know the cause?