Thunderbolt problem connected to external display

2011 mbp 2.3ghz 15" while connected to a external display the screen goes wacko. When i disconnect the external display it works fine but i do computer aided engineering and cad and need a bigger screen so this is annoying. It's connected to a 23" lg led display via mini displayport/dvi adapter.
It happens while in Windows7 bootcamp and in lion 10.7
I tried to install the thunderbolt firmware update but it says it doesn't need it.
Is this a common problem?

Alright then try the following:
http://support.apple.com/kb/ht1379
and
http://support.apple.com/kb/ht3964
Let us know if it fixed the problem

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