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How to enable overscan/underscan slider in Displays Preferences?

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Sep 1, 2012
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105
Motherboard
Gibabyte Z77X-UD5H
CPU
I7-3770K
Graphics
GTX 980 Ti
Mobile Phone
  1. iOS
Hey everyone,

I have issues with my overscan and underscan on my HDTV. Unchecking the overscan option leaves a foot of black border around the image, while clicking the overscan option leaves way too much of the image out.

My television does not have any overscan/underscan options, and I would really not like to have to deal with SwitchResX - I've never had any success with it in the past and it seems like the developer has given up on the program.

My question is - how do I enable the overscan/underscan slider in Displays under System Preferences? My computer is configured as a Mac Pro 3,1 right now.
 
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