screen keeps flashing when try to attach Acer AL1916 external monitor.
i have a new macbook pro and when i try to attach a Acer AL1916 External monitor the main monitor start flashing for about 10 min. and stops with out recognizing new monitor. i am connecting external monitor with a HDMI to VGA adapter. i am also running Yosemite version 10.10.5. what can i do to get external monitor to work properly?
MacBook Pro with Retina display, OS X Yosemite (10.10.5)