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There are options to adjust the the overscan settings in /boot/config.txt.

# uncomment this if your display has a black border of unused pixels visible
# and your display can output without overscan

# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border

Is there any way for me to "test" the overscan_* settings instead of manually editing the config file, restarting the system, checking if the settings need adjusting more, then restarting until all the settings fit nicely with my monitor?

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I'm hoping there is some sort of application that has screens such as "Press the left or right arrows until the entire box is inside of the screen". –  IQAndreas Sep 3 '14 at 19:42
Check this article Overscan settings in Raspberry Pi –  user3817842 Sep 4 '14 at 18:31

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