My macbook is back from repairs. It is not working with my apple led cinema display. It was working prior to the repairs on the laptop. Is there a setting I don't know about that might have been changed?

My macbook pro is just back from repairs.  It is not working with my apple led cinema display. I have followed the directions in the cinema display manual.  am I missing something?

Take a look at the Displays preference panel to see if everything is ok, particularly the resolution and refresh rate.  Displays will probably try to put the panel for the ACD on the ACD where you won't see it.  So click "Gather Windows" to get the ACD panel on to your macbook.
One more thing, make sure you fully seated the mini displayport plug.  They can be sneaky little devils in that they need to be fully pushed in.

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