G4 Dual 1GHz MDD slows to creep then freezes

I have an employee running MacOS X 10.4.7 on a G4 Dual 1GHz MDD with 2GB RAM. This employee is having problems with the system slowing to an absolute crawl, where there are delays even in mouse movement. The system then finally locks up, and the only way to restart it is manually. Over the past couple of weeks, I have done a clean install, replaced the hard drive (because the original one completely died), and replaced all of the RAM. I have run disk and permission repairs multiple times, and have wiped out the cache multiple times.
The only thing I see left to replace is the video card. Could this be the culprit, or do I need to look at replacing the system with a new Mac?

The only background applications that have been installed are Retrospect Backup Client, and FontAgent Pro, both of which are installed on every other Mac at the office.
I have not run memtest or any other memory tester, however, the fact that I can take a complete set of RAM out of an identical machine that is stable, put it in this one, and have it still crashing should cancel RAM out as the cause of the problem.
I replaced the hard drive with a 250GB Western Digital. It is the only hard drive, so their should not be any IO conflicts between it and other drives. I have used FSCK, Disk Utility, and Drive Genius to check the drive and they all say it is good.
There are no 3rd party PCI cards installed in this system.
This Mac is configured just like all the other identical ones in the office. In fact, due to just having a clean install performed, it is even cleaner than the others.
I have reset the PRAM and NVRAM. Sometimes after resetting these, the system locks up before the gray apple even appears, requiring me to run FSCK. I have not reset the PMU yet.
Is it possible it is a bad video card? I know an inexpensive card can be obtained for testing, but my main concern is the time it will take to get it in. I don't want to waste that time if it is obvious the video card is not the answer.

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