Existing users, 
Apple Leopard Graphics
for OS X 10.5.2
Version: 1.0
Did not fix ATI Radeon 9600 screen flash
Feedback Type: Commentary
Contributed by: Dester Wallaboo Monday, February 11 2008 @ 12:00 AM PST
Product Platform: MacOSX
Used Product For: Less than a month
OK.... updated one of our G5's to 10.5.2 and then installed the Leopard Graphics update. The pink/green intermittent screen flash (every 2 minutes or so) is still not fixed.
Comments
Did not fix ATI Radeon 9600 screen flash - Dester Wallaboo
I've read the forums on the Apple site and there are LOTS of people with this problem. For everyone, including us, this didn't problem didn't show up until the day we installed Leopard.... and it has persisted throughout all the updates.Monday, February 11 2008 @ 12:00 AM PST
Did not fix ATI Radeon 9600 screen flash - GGGlen
Hmmm...I work with roughly 150 G5's, and none of our ATI Radeon 9600's ever had the problem you're describing, and none of them have the issue after installing the updates.
Are you certain you don't have a hardware defect?
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Monday, February 11 2008 @ 12:00 AM PST