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Jan 17, 2016 8:57 AM in response to blargwyirby judysings,Hi blargwyir,
The resource below provides some options for configuring the resolution for your external display. You may need to refer to the manufacturer for additional guidance regarding best resolution for your model.
Get help with video issues on external displays connected to your Mac
Change your display resolution
- From the Apple menu, choose System Preferences.
- Click the Displays icon.
- Click Default for display. If you see more than one resolution listed, choose a resolution and refresh rate. If the display turns off when you change resolutions, press the escape key to undo the change.

If you can't change the resolution of your display because you can't see an image, restart your Mac in safe mode to reset the display resolution to defaults.
If starting in safe mode doesn't resolve the issue, reset your Mac's NVRAM and SMC to reset the video ports on your Mac to their defaults.
Take care,
