Problem connecting a 24" Cinema Display to an Imac 27"

My friend has an Imac 27 "with a graphics card AMD HD 6970M 1GB. She wanted to connect an external Cinema Display 24" (without thunderbolt serie). The external display has started to display black screen intermittently while making a strange noise. Before this screen, there was a aluminum  Cinema Display 20 " which never had any problem. The 24" Cinema Display was just before used as external screen for a Mac Book Pro 15" (main screen, no dual screen) without problem too.  Any idea? Is the card too weak for such a configuration?The iMac was purchased on October 15th on the refurb. The Os is Lion 10.7.2.

If the computer doesn't have a Mini DIsplayPort or DisplayPort, not until September; click here for more information. If you mean the MagSafe connector, leave it unplugged; it's only for laptops.
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