Imac 9.1 Cinema Display 16:10 - not working?

Hey I am despratly trying to get a second Monitor to work on my Imac. This is what I have done so far:
I used a MiniDisplay Port to DVI and a MiniDisplay Port to dual Link Dvi both are working with a different 4:3 Monitor.
I get a dstorted Picture on my Cinema Display.
After that I borrowed a Usb to DVI Adapter from Displaylink there I sometimes get a picture, most times nothing.
My Cinema Display is damaged you say? No it is working perfectly fine with a Win-Pc.
Any Ideas or experience with an 9.1 Imac and a 16:10 (24") Cinema Display?
Thx

If the resolution of this external monitor is greater than 1920 x 1200 you need a dual link DVI adapter. If the computer sees the monitor then there will be an Arrangement tab in the Displays system preferences. Otherwise something is physically wrong.
In the Displays system preferences click Detect Displays. Maybe Gather Windows too if you currently cannot see an image on the external. Check the resolution of the external in that monitor's Displays preferences. If there is a refresh rate, check that too.
Don't run in mirrored mode.

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Imac 9.1 Cinema Display 16:10 - not working?

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