Leopard works fine, until I do the software updates.  Snowy start screen?

Leopard is new for my 1.8gHz IMac G5.
I installed it, then did the Software Update.
When I restart the Mac, I get a snowy glitchy start screen. The monitor still has some quirks here and there after it starts, or it won't. Very inconsistent. It sometimes behaves very slowly after that. Even with only one program open.
I reinstalled the OS, but this time checked the StartUp disk with no errors. Checked Permissions too, just to be sure. No errors.
I then wiped the Hard Drive clean with a fresh install of Leopard. It was fine...until I did the Software Updates again.
I have wiped it clean again...but now I didn't install the Software Update. ...which I'm sure I need.
What am I missing here?

I'm now thinking this could be a hardware issue.
As in, my monitor or the motherboard...or a transistor or something. ANYONE ever have a 'monitor' issue on an iMac like this?

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