HT3258 Upgraded to Lion and now I can't get my monitor to work

I just upgraded to Lion and now I can't connect to my Dell monitor. I am using a MacAir. I have tried chaning the input. But that didn't work. Any suggestions?

That was a widely publicized fact, it is a good idea to always check compatibility before upgrading. Your options are to go back to SL or find another app.

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