imac external monitors

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Nov 13, 2012
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I have an imac 3.06 GHz 21" and want to use a second monitor, I have the right connections I think (I simply put the connection into my macbook and it worked fine) but the comp does not see the second monitor does anyone have any ideas how I can fix this problem?
 
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Which adapter/cord do you have?

Please list your models (MacBook & iMac). You can get help identifying them at the following site:
Code:
http://www.everymac.com/
 

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