Second monitor stopped working on upgrade to 10.10

I recently upgraded my mid 2010 Mac Pro from 10.6.8 to 10.10.1. This upgrade resulted in the loss of signal to my second monitor. The primary monitor connects via an hdmi/vga adaptor and the second monitor uses the video card vga connection. Both monitors worked fine until the upgrade. After the upgrade the main monitor works fine. The second monitor is recognized and appears in the system preferences-Displays as well as the System Report-Graphics/Displays. Looking the other way the computer connection is recognized by the monitor. The second monitor is black screen with a no-signal message. I have checked all connections, reset the prom and tried various connects and dis-connects of the video cables and restarts all with expected results just no picture on display two. I have not yet reset the SMC because I am not familiar with any associated consequences. Any suggestions are appreciated.

Resetting SMC could solve the problem, though try reverse the connection way(main monitor connect DVI directly and second one via the adapter) could solve the problem.
What's video card are you using by the way?

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Hello @Pandapower,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I have read your post on how your notebook display screen remains blank when you power it on, and I would be happy to assist you in this matter!
To return the functionality back to your computer's display, I recommend following the steps in this document on Computer Starts but Screen Remains Blank (Windows 8).
If the issue persists after completing all of the steps in the resource above, please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region.
http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
I hope this helps!
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I work on behalf of HP
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Second monitor stopped working on upgrade to 10.10

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