20" white iMac: lines on screen

Ever since installing Snow leopard on my 20" 2.16 Ghz white iMac I get strange lines across my screen when I do things like opening a Finder window or change the screen resolution. Any suggestions appreciated.

I have iMac (Early 2006) http://support.apple.com/kb/SP35
This issue first occurred when I upgraded to 10.5. And now after 2 days running (or - trying to run) Snow Leo I can say - no improvement. I have lines and other shapes, all across the display. Always. Anyways - maybe You'd feel better about Your situation when I told that this issue leads to total hang and thus "hard restart" as only solution. Both on 10.5 and 10.6 it's happening about 6 times. A day. But You're not alone http://getsatisfaction.com/apple/topics/2006imac_graphics_card_crashfreeze and as Richard said - just google up.

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