Macbook Pro won't work with external display?

The very first time I connected my brand new Macbook Pro to my 23" Cinema Display the laptop screen displayed mostly static, though the external monitor continued to work. The computer was sent to Apple for repair. Apple replaced the logic board. Though the nature of the problem changed following the "repair" (the Macbook's screen now goes dark instead of displaying noise) the laptop still will not drive the external monitor successfully without multiple re-starts. I've experimented with turning the sleep mode on and off as well as the screen saver. No effect. Is anyone using this set up successfully or is there some fatal design flaw in the Macbook Pro? System 1.4.8, 2 gigs RAM. Thanks.
Macbook Pro Intel Duo   Mac OS X (10.4.8)  

Thanks for the input. Yes, I've driven the 23" with another Mac. I took the laptop back to the shop today. Hopefully they can resolve the issue.
Macbook Pro Intel Duo Mac OS X (10.4.8)

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