How can you reset the video adapter on a MacBook?

My MacBook will only display in monochrome. Went into Preferences and reset resolution and color profile. And no change. Reset PRAM and still no change. Can anyone recommend a solution for resetting the video? This occurred after hooking up an external HD display and streaming video to an HDTV
Thanks in advance and Happy New Year!

The SMC reset does something different than
a NVRAM-PRAM reset, have you tried it?
•Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
PS: was the Universal access system preference panel setting checked
to see if it was the cause of Grey-scale contrast change in the display?
http://etc.usf.edu/techease/4all/vision/how-do-i-change-the-display-contrast-in- mac-os-x/
There may be something else going on.
Good luck & happy computing!
{edited}

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How can you reset the video adapter on a MacBook?

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