IMac G5 - Pixelated Finder screen

Hi guys,
Wondered if anyone can shed any light on this. I keep getting a pixelated finder screen - not all over but as if the screen hasn't rendered properly. It happens infrequently when I boot up in the morning & it also occured when the computer was running the black swirly screensaver - I clicked the mouse & it left a kind of line of black pixels. If I do a re-start it seems to be okay. The compuer itself seems to be running okay - I'm using quark, illustrator, photoshop, entourage etc.
This morning I had a bit of a scary moment: Booted up & again there were traces of white/grey pixels. When I booted up entourage, it opened as a black image. It allowed me to quit. I went to the finder menu & restart & the restart box came up as as a black box. I clicked in the area where I knew the okay button was & the computer restarted fine.
Anyone any idea what is going on? Do I need a new graphics card? The computer is only 15 month old. Surely it can't be on it's way out already? We've had some really hot weather - do you think it's the heat?
Any help greatly appreciated, I'm working for myself here at home & it's a lonely thing when your main business tool starts going a bit wappy!
Thanks in advance, Mel

Mine too! Within the last week the screen started flickering and has now settled into an almost monochrome blue. My photoshop defaults are white and blue; even the flurry screen saver is on a field of blue. What gives? The RGB now seems mostly B.
My iMac g5 17'' display has turn bluish, but when i
connect an external display it seems fine. Does
anyone know what's wrong?
20in iMac G5 Mac OS X (10.4.9)

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