Detect displays not working on macbook pro

My external monitor no longer works with my MacBookPro.  I know the monitor works because I also use it with my old G4.  Could it be the miniVGA cable that's defective?  Also, the "detect display" command doesn't work

I just purchased a 13" Mid 2012 MB Pro, first time on YouTube, the videos would not play, google "Adobe Flash", download and install the player and you should be good.

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