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Jan 2, 2016 10:57 AM in response to dougnourseby Malcolm J. Rayfield,★HelpfulCheck the specs on the display. Some do not provide the same resolution on all ports.
Try to avoid using any adapters. If the display has DisplayPort or Mini DisplayPort, connect it to the Mac's Thunderbolt port with a Mini DisplayPort to DisplayPort or Mini DisplayPort cable.
If using HDMI, go directly from the Mac's HDMI port with a high quality cable.