IMac G4 graphical issues- 10.5.8 (w/ Graphics Update 1.0!) Help!

Hi!
I've searched EVERYWHERE for help with this- ot no avail . I have a 700MHz (15") iMac G4 (32MB Nvidia GeForece2 MX) 1GB RAM, running Leopard. Unsupported, yes, but with LeopardAsisst, CleanMyMac and Monolingual, it has been running extremely well despite the curcumstances . But I have re-installed OS X countless times (Clean, Archive & install, etc) Cleaning caches/optimizing/countless tasks w/ OnyX, and every time i wake from sleep, little lines of pixels like this: --- show up multicolored, and never go away until a reboot. what's worse, if you move the mouse, they follow it and make a horrible path of colored lines. Also, when I open Grids in the Stacks folders, the outside of it is lined with weird patterns and colored lines. I honestly despise Tiger after living in the luxury of Leopard, and since performance isn't an issue, what's left? Many others have put Leopard on unofficially, and have no problems! I'm so aggravated, and I just want a fix- permanently. Any ideas? Please help! A 13-year-old could barely afford a G4, let alone a NEW Mac! Graphics Update never helped, and I have (in my many re-installs) used every update of Leoaprd, without a fix. Surely there is one (fix)? PLEASE help, and thanks so much- I can give any more info if desired! P.S. My iMac is upgraded from head to toe- 120GB HD, 1GB RAM, SuperDrive, Clock Battery replaced, (obviously no CPU/GPU upgrades as it is soldered to the logic board) Again, thanks!
All respect,
Noah Budgor

I assume you tried resetting PRAM and PMU...?
If you have the iMac plugged into an old or overcrowded power strip (surge suppressor), be sure to try connecting it directly to the wall outlet (as a test) to see if it makes any difference.
You said that you tried many re-installs... If you re-installed Tiger instead of Leopard, does this problem recur?

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