Up-Dated to 10.9.3 and now my 30 inch monitor does not turn on

I just up dated to 10.9.3 and now my 30 inch monitor does not turn on, only my 24 inch one does. But if I disconnect my 24 icy one, then my 30 inch works. this was not happening on 10.9.2. what is wrong?

My problem is fixed. I phoned Apple and they put me thorugh to an engeneer and he epxlained to me how to re-set the PRAM and I did and it worked. Both my monitors are up and running again.
Shut down the computer, when you start it up again after the start up sound press at the same time the ALT, COMMAND, P and R buttons until you hear the Mac start up sound again.
It worked.
Thanks again Apple and omit.
Antonio

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Hello KaitlinHertz3,
Thank you for using Apple Support Communities.
For more information, take a look at:
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http://support.apple.com/kb/ts3899
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cflannigan60 wrote:
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http://support.apple.com/kb/HT1766
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Message was edited by: schelling

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Up-Dated to 10.9.3 and now my 30 inch monitor does not turn on

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