2nd external display no longer being recognized after updating to Yosemite

using a 2 yr old Macbook Pro 15 with 2 external monitors. No prior issues when I was using Mavericks but since switching to Yosemite yesterday, I've not been able to get the system to recognize the 2nd monitor. I've restarted the system several times and still nothing. I've also checked all connections and made sure everything was secure. What can I do to resolve this issue???

Anyone have any help or suggestions? Thanks

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Last edited by thea (2015-02-23 14:38:28)

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