Yes..there is picture on the 20" cinema screen when the laptop is opened and the power cord is plugged in. But as soon as I close it....the screen goes blank.
I'm following this disscussion as I have the same issue. I tried your suggestion of plugging a mouse and a keyboard into the new macbookpro but, with the lid shut, the 20" cinema display remains black.
Any other suggestions?
Furthermore, I notice that the screen resolution is poor. I have another 20" display in the office - that one plugged into a G4 tower and it shows far better resolution. I've got this new 20" display on the highest resolution settings.