Alu iMac 2.8GHZ 2GB RAM ATI2600HD

Hi,
Having bought the above iMac and then installed Leopard I have a problem where the screen jitters whenever you move the mouse. I have installed the latest software updates to no avail. Here are some of the facts that I have.
1) problem did not occur on Tiger (the OS installed when the computer was purchased 2 months ago)
2) I have latest software update installed - still occurs
3) I have changed the mouse - still occurs
4) I have moved the mouse to a different port - still occurs
5) I have changed the resolution to all that are available - situation still occurs in all resolutions
Has anyone else seen this problem?
Kind regards

Hi CrobinsonH-
Greetings and welcome to the Apple boards.
Do you have the zoom function enabled? Option-command-8 turns it on and off.
Luck-
-DaddyPaycheck

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Hi-
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iMac late 2009 reads only 2GB RAM,I have re-installed the card 10 times now,what else could I do?

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