Second display won't work on mac partition but works on windows

Hey I have a 21.5" imac from mid 2011 and have recently update to OS X Mavericks.
I bought a mini dp to hdmi to connect a second monitor up to my imac a month or so ago. At the time I was running 10.6.8 and thought that may be why it wasn't picking up the second display.
All the while the second monitor has been working fine on my windows 7 partition.
Hoping anyone can shed some light on this.
Thank you in advance for any help you may be able to give

Hello Connarhea,
Thanks for using Apple Support Communities.
For more information on this, take a look at:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Best of luck,
Mario

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Second display won't work on mac partition but works on windows

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