Thunderbolt vs. Apple Display

Hi guys

I just bought a new macbookpro 2011 with thunderbolt port and I'm working with 24'' Apple display bought in 2009. But since I

plugged the display's cable into thunderbolt port my display isn't working good. The screen became black a few times

and is "shaking" too.

I installed the thunderbolt softwear update tha apple offer but the problem still rolling.

With my old unibody macbookpro 2009 was working great!!!

Someone help me?

Thanks.

Guilherme - from Brazil