Need advice regarding 23in Cinema HD Display

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full disclosure - i'm relatively new mac user. own used 2011 macbook pro. inherited 23in cinema hd display (box has 2003 date on it) has dvi adc adapter. display port came doesn't work laptop through apple's advice ordered mini display port dvi adapter. plugged in , turned on laptop , desktop screen on hd display not laptop nor can access various applications. since i'm new mac i'm wondering if there few more things need through laptop , running. looking help/advice/tutoring.

thanks,
joepop
 

so saying theres other desktop showing up, or nothing showing up?

if nothing showing toolbar @ top or dock @ bottom, screen has background, operating in extended desktop mode. can drag windows on cinema display. however, post kind of vague , confusing, answer questions first.

have laptop open?

cinema display mirroring laptop display?

cinema display extension of laptop display, can drag example safari window cinema display dragging in direction off of laptop display?

laptop closed (aka clamshell mode) the desktop on cinema display?

see dock or toolbar or on cinema display?
 


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