Upgrading G4 Video Card Problems

I have two G4 computers that I have tried to upgrade to System X. Both of them basically crashed.
1) My tech replaced the hard drive in one, but it still doesn't work: If you leave it for a while and start it, it seems to boot fine, but as you work on it, patches of squares, partial windows appear, and then everything starts to go crazy. If I restart it right away, it never completely reboots, the screen develops vertical lines and it tells me to restart my computer.
2) This one (a friend's computer) I downloaded System 10 and it was fine. He had very little RAM, so he went and bought more. We installed the new RAM and then went online to upgrade to the newest version of X. It locked up and when I try to restart it, the screen gives me lines and then locks up again.
What is up with this? Another friend had the same thing happen. I have spent $350 on a new hard drive, CD burner and the tech to install it all, and now he says there is something wrong with either the video card or the logic board. I feel like a poker player who is "pot commited" and betting on a losing hand!
My friend said screw it and went out and bought a new one. I can't afford a new one, but now I have his and mine and I was hoping that between the two of them I could make one work. His is older but is still a G4. Ideas?

Hi and welcome to Discussions.
Depending on the exact G4 model(s) you have, a firmware update may need to be applied if it hasn't already been:
http://docs.info.apple.com/article.html?artnum=86117
The following link should help you identify exactly which G4 model(s) you have and whether a firmware update may be applicable:
http://docs.info.apple.com/article.html?artnum=58418
http://docs.info.apple.com/article.html?artnum=42739
OS X also seems to be quite picky when it comes to RAM and memory that's slightly out of spec may cause problems. If you have any third party DIMMs (memory modules) installed, you could try removing them, assuming you'd still meet the minimum requirements for OS X.
For future reference, hard drives and CD burners etc are considered customer installable parts in the G4 towers and installation instructions can be found here (depending on the model):
http://docs.info.apple.com/article.html?artnum=75312
http://docs.info.apple.com/article.html?artnum=75313
http://docs.info.apple.com/article.html?artnum=75314
I assume the computers were okay running OS 9 before hand?
Do you still have the Apple hardware test CD that probably shipped with the computer(s)? This should include a VRAM (video RAM) test etc.

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