External screen garbled colors, MB screen OK

This morning we had the surprise of having garbled colors on one of our Macbooks. This one is connected through a DVI-minidvi adaptor to a Viewsonic 21" external display. The Macbook is 4 Months old and has been working perfectly with this setup until today. The internal screen works perfectly. At first the extrenal screen showed the usual image pattern but filled with pink and magenta lines.
I've replaced the dvi adaptor by a newer one: same problem.
I've connected another macbook to the supposedly faulty Viewsonic screen: the screen works perfectly.
I've connected the supposedly faulty Macbook to another viewsonic screen in our office: the same problem appears. So the screen is OK.
I've toyed with the screen settings in the system prefs and the screen has suddenly come back to something closer to normal but has now tony pixel -size red, blue and white dots that appear at random (they do not blink, they're just there. Restart doesn't change a thing. I've reconnected to the original external screen: dots still there.
When external screen is disconnected, the Macbook's internal screen works perfectly, no dots.
Could this be a software problem, a problem with the internal parts of the hardware connectors?
Please help.
Mark

Because this problem occurred with two adapters, and not with another macbook, I would suggest that the mini-dvi port is suffering from a hardware problem. As your computer is four months old, I would take it in for service.

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