External display, don´t connect after the upgrade to Lion?

I frequently use an external display when working. Now after the upgrade to Lion the mini dvi port seem to work. Signal goes though but no picture. Display works fine with my other Mac. Really need this to work. Pleas help me out and I´ll buy a new MacBook Pro A.S.A.P . 

Still sounds like the display port is not sending out a video signal.
Try this:
Leave the Mac powered on, close the lid, wait for it to go to sleep. Using an external keyboard, press the space key. This usually activates and wakes the computer back up to using the external display port.
- Mark
MH Tech Solutions, LLC.

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