Press the key to switch from VGA port to builtin LCD. It's Fn + something. The Fn (function keys) modify the key pressed, like the shift key, and keys with function modifiers have the same color as the Fn key, usually.
I have dealt with that, but in my case it was the laptop monitor, bout 4 laptops, all twinheads..Try plugging a monitor into the laptop, and check the connection from monitor to the mb..
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