Display Error - weird black/blue flickering boxes on display

I have recently started experiencing a very strange error with my iMac G5 display. I notice it most when using Expose. As the screens zoom in and out, several black or blue boxes can be seen flickering in the background. Each box is square and approximately 2 inches x 2 inches.
Also, if I scroll my mouse across the icons in my dock, suddenly a large, very zoomed in version of my dock is superimposed over the actual dock. Sometimes random black boxes appear behind an icon in the dock too.
If I activate expose, the boxes or zoomed in dock disappear. Also if I scroll up and down a page, the boxes vanish but can sometimes reappear later.
It started a few days ago, but then went completely by itself. It's just started up again tonight. I haven't changed anything on my computer or downloaded anything that might have caused this issue.
I'm not sure if it's a hardware thing or something wrong with my settings. Any help would be gratefully appreciated.

I have already checked those and neither are activated.
Also, if there is an animated gif, or something that moves, the entire display is filled with a horizontal line that's the same colour and height as the gif. If I refresh the screen or activate expose, it vanishes, but then comes back pretty soon after,
It's funny because I've had it on most of today (after being shut down all night) and it's been fine. It's just started again this evening. Makes me think something could be overheating perhaps.
Thanks for trying to help anyway.

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