There's one thing that I wish was built into every computer monitor: a self test feature. You'd turn it on, and if a computer wasn't hooked up it should generate a test screen. Some of the newer monitors have it, however it's usually a small square that bounces around the screen.
What I really want is to have it generate a screen full of red, green, blue or white so I can see if there's anything wrong.
I thought this XGA monitor test dongle was pretty cool. Just plug it in and it'll generate VGA signals so you can tell if the monitor is working correctly.
http://www.cdadapter.com/vgase10.htm
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