Yosemite does not recognize external displays...

I will bring this up again since I know a lot of people are having this issue, myself included, and the previous forum indicated that the problem was not solved although it as marked as unsolved  
Can anybody offer some help?  Ever since I upgraded to Yosemite, my Macbook Pro (15'' 2013) won't connect to any external monitor, projector, etc.  Not OK.   IF you haven't upgraded to Yosemite yet, DO NOT UPGRADE!!!!!

Hi SS7886247,
I see that you are having issues with your external display since the update to Yosemite. I would like to suggest that you perform a PRAM reset to see if this troubleshooting step affects the issue:
OS X Yosemite: Reset your computer’s PRAM
http://support.apple.com/kb/PH18761
There are some further troubleshooting steps found in this article as well:
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
http://support.apple.com/us-en/HT201177
Thanks for coming to the Apple Support Communities!
Regards,
Braden

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