I'd recommend hard resetting and installing your apps over again, one by one.
Like the guy above me said, try not to install too many today screen plug-ins and if you do, install them to main memory.
The 4700 itself is a great machine, its just software compatibility issues with wm2003 SE and VGA that cause problems. If you can find the right software, then you won't have any problems. I soft reset maybe once every few days, and I use my PPC a lot.
There's a nice list of VGA friendly applications here:
http://discussion.brighthand.com/sho...hreadid=111132
It's a good place to start