Small line running along bottom screen

Joined
Apr 27, 2015
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I have a viewsonic VX922 21" monitor that I bought in 2006.

For a while now I have noticed a small line at the very bottom of the screen that changes color, patterns, and sometimes doesn't show up at all! I have been using it full time as a display for a Mac Mini running leopard, and although it isn't an everlasting problem, I would like to get rid of it. Any ideas how?
 
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