IMac G5 OSX 10.5.1 display flicker

Coincidentally with the installation of Leopard, the menu bar on my wife's G5 iMac 20" developed an intermittent flicker. Very annoying but does not compromise performance. Might this be a software issue or heaven forbid a harbringer of hardware problems?

Mine has been flickering since upgrade to leopard. sometimes minimal (only when mouse moves) sometimes the whole screen goes crazy with static lines running the entire width of the screen (thousands of static lines) and making the screen totally unreadable. i dont know if this is related or not but it seems like my iMac G5 also stopped going to sleep and last week it's just shut down on its own a few times and then would not restart, going to the startup screen with the apple logo and rotating lines, then the fan goes into turbo overdrive and stays that way without starting up. Since then, I frist tried the original leopard disk and the iMac's drive did not shop up, and then did a file structures repair with Tech tool pro and the iMac then restarted with the Leopard disk and I did a repair and the iMac was able to start up on its own. I left it over night and the iMac appeared to go to sleep but in the morning, I pressed a key onn the keyboard and it shut down. When I tried to start it again, the same thing started all over again with the fans at max speed etc. I'm going to try format the drive and rebuild. All this seemed to have started since Leopard. However on my MBP, its been all good.

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