Both Displays Blink on and off After Waking

I recently got an external display (22" LCD monitor) for my 12" PB. It looks beautiful, but whenever I wake my laptop from sleeping, or I reconnect my display, both screens alternately go black. They keep briefly flashing their desktops until I give up and hard restart my computer. This only happens when I use my mini-DVI to DVI connector. Mini-DVI to VGA works fine, but it doesn't go up to 1280 X 1050, which is what looks stunning.
Does this sound like a graphics card issue? Or is my aging/well-loved PB just not up to the challenge in some other way?

Long story short I solved the problem, and it was totally a model issue. It is the HP w2207, which apparently has a problem with iMac 24 inch, the nvidia graphics card, mini DVi to DVI and 10.4 in particular. You see these two devices, just don't get along very well. The imac tries to auto set the monitor at one resolutions and the monitor tries to auto set itself at another, and they will continue to do this indefinitely. However both when I switched to a VGA cable, which I believe prevents the monitor from auto setting itself, and when I upgraded to 10.5 solved the problem.
Personally I didn't mind the upgrade, as I was planning to do it anyway, and is definitely the better solution as there is noticeable difference in the color between the two cables.
Anyway thanks for the help everyone.
Message was edited by: Stephen Ethan

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