External Monitor Shows Only Black Screen ??

Recently, my PowerBook G4 12" stopped working properly with my external monitor. My external monitor is a Dell 2005FPW that is connected to my laptop via a mini-DVI adapter, a VGA cable to the VGA port on the 2005FPW. When connected to the laptop, the 2005FPW goes black; otherwise, the monitor shows it's "rest" screen which is a bouncing color bar.
This system has worked without problems for years. I changed nothing in the configuration and (possible red herring) the only "event" prior to the problem developing was that I installed the "Security Update 2008-005 (PowerPC) v 1.0".
I have confirmed that the monitor and VGA cable are working with my wife's laptop.
Today, I replaced the mini-DVI to VGA adapter, and the problem hasn't gone away.
Any suggestions?
Michael

Did it develop around the same time, after you downloaded the security update?

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Scan Rate............... 74,038 kHz 59,950 Hz
Image Size.............. 519 mm 324 mm
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