I have a G4 iMac which had similar problems, particularly the odd
artefact, menu bar not rendered and old screen images still present
until you open another window over them. It was worse when it got
warmer (summer) but ran almost all winter without a problem.
Eventually it got worse and worse until it finally gave in.
It was a Vram problem. Hardware diagnostic program on the boot/instal
CD (OSX 10.2?) found the problem. Replaced mother board (to which
Vram and Video is soldered in the case of the iMac). Has worked
perfectly since.
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