iMac G5 Screen Freaking Out

It could be the game itself. Have you run all the updates (if available) and is everything else up to date?

Also, you do not say which model iMac you have, but by any chance is it one of <a href="http://www.apple.com/support/imac/repairextensionprogram/"these</A> models effected with bad video and other midplane issues?

Which 20" G5? First, second, or iSight generation? Does yours fall in the range of serial numbers that I gave you a link to?

Sorry to sound snarky. I must have left that link info off of my post.

Since yours is an iSight model, that info doesn't apply anyway. It still might be a bad midplane, so you might want to call Apple and see what they suggest.

"Midplane" is Apple's term for the motherboard in the G5 iMacs.

More than you ever wanted to know is here in a Wiki article. It the main board that everything plugs into in any Mac or PC.

I had a very similar problem to this.
i have a G5 iMac iSight.

where my screen would freeze and to put it simply, everything would look pixelated.
this would typically happen when i would be puttin a CD in the drive with iTunes open. typically, the freeze is immediately preceeded by something similar to a "pop" sound.

after a similar freeze with iPod running into the stereo, i've come to think that this problem is most likely static shock. the pop must have been static electricity from my fingers...anytime i touched my iPod when running into the stereo i would get a shock, which would sometimes freeze its screen.

I'm assuming that these two issues are the same. Now, just to be sure, i touch the metal plates on the bottom of the iMac every now and again to draw out any static that may have built up.

not sure how this might relate to your issue with the game, though.

iMac G5 iSight Mac OS X (10.4.6)