TSG: Black bars on a display
Overview
When using a pen display or a monitor you may experience black bars on the display. They may appear on the sides, on the top & bottom, or on all sides.
Causes
Incorrect resolution send to the display
If there is a mismatch in the resolution your computer sends the to the display and the native resolution of the display, bars can appear. This is especially likely if the aspect ratios differ. For example: if your monitor is 1920x1080 but it receives a 1920x1200 signal you will get vertical black bars on the side.
Duplicated/Mirrored displays
If you are mirroring two displays, and they have different resolutions, black bars is very common result.
Things to try
Verify the resolution being used for the video signal being sent to the display
Disable display duplication/mirroring
Try a different video port
Links
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