How do I get my new AOC monitor to display at 1440p connected to my iMac?
I have a 27 inch iMac (late 2009) running OS X El Capitan v 10.11.6 . The built in display is 1440p. I just bought an AOC Q2778VQE monitor that is supposed to display 1440p, but I cannot get it above 1080p. I am using an HDMI to Mini DisplayPort cable. How do I get the AOC monitor to display at 1440p? I have gone through the System Preferences and gotten no where.
Thank you
iMac, OS X El Capitan (10.11.6)