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Helpful answers
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May 21, 2015 1:33 AM in response to Bytestreamby lllaass,The scanning option only is present n the Mini with HDMI input.
Try using an ap like
SwitchResX – The Most Versatile Tool For Controlling Screen Resolutions On Your Mac
Display Menu from Mac App Store
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May 21, 2015 7:19 AM in response to lllaassby Bytestream,I tried connecting via HDMI and the scanning option is not there. Tried the resolution apps and no luck either ... The screen is crisp and clear and is at 3440x1440 but not filling the entire screen .. Switching to other resolutions produces the same issue, yet using a MBP does not .. got to be something with the Mini?
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May 21, 2015 7:33 AM in response to lllaassby Bytestream,Those suggestions seem like resolution fixes which does not seem to be my issue .. the native monitor resolution is 3440 x 1440 and the Mini is set at the same resolution ..
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May 21, 2015 7:38 AM in response to Bytestreamby lllaass,But you seem to really not getting that resolution.
If it shows a partial seen that partial screen is not 3440 x 1440
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Jul 16, 2016 12:08 AM in response to Bytestreamby purinachow,I had this problem with black borders too (0.5" at the top and bottom and 1.5" on the left and right sides), tried different mini to displayport and hdmi cables, searched for answers (which were sparse), nothing worked. I am using a MacBook Air 2015 13". On two monitors, LG34UM95, and LG34UM68, the exact same problem was replicated on both screens. The resolutions were showing as 3440*1440 and 2560 *1080, but it was the same black borders all around. I was desperate and thought it's a problem with my cables, El Capitan, or macs not working with LG monitors.
Underscan option only showed up on hdmi but was still not putting out the full resolution (1920px max width) - desktop was not filling the whole monitor screen, just half of it. Well, we actually don't need to adjust this setting at all.
Here are the steps that worked for me, using mathewwinkson's instructions to force RGB mode in mac osx to fix the picture quality of an external monitor. After following all the steps and restarting for the final time, I was amazed - there are no longer having black borders around my desktop image on the monitor! Finally, I can enjoy the full quality of this beautiful widescreen monitor.
Make sure that you are in the system library folder, not user library folder. Cheers.