Mac Mini - Paslam = horisontal lines

Hello all!
I am trying to connect my Mac Mini to a plasma (Panasonic TH-37PV45EH) via VGA. Everything is looking good until I log in. Then the screen turns into horisontal lines. Please, if anyone have a solution to this, please advise me.
Best regards

The Mac is switching to an unsupported resolution when logged in. Try starting in Safe mode and see if the problem goes away.
http://docs.info.apple.com/article.html?path=Mac/10.6/en/21245.html

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