IMac display jumps 1 pixel left and right

Has anyone ever heard of this before, it seems crazy to me.
My iMac display started acting up two days ago.
When the cursor crosses the screen from side to side, the screen jumps 1 pixel to one side!
Specifically, moving the cursor from left to right, the screen jumps 1 pixel left (as if it is panning over to that side) and and the reverse for the reverse direction.
The 'extra' column of pixels appears normal (ie not simply black).
The picture is a little fuzzy.
At lower resolutions, the screen looks terribly fuzzy like the anti-aliasing has become overactive (maybe this is a known issue for this video card) but doesn't jump.
I've repaired permissions, rebuilt things, etc (using Onyx and also applejack) but no change.
After my previous mac died prematurely I was sure to get Applecare for this iMac and need to take it back anyway (the dvd-burner has predictably failed) but I I was surprised I'd never heard of my pixel jumping problem before.

More than likely somehow 'Zoom' got turned on.
To disable Zoom, open System Preferences->Universal Access preference pane and disable Zoom.
Mac OS X 10.4 Help: Setting zoom options for viewing your computer screen

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IMac display jumps 1 pixel left and right

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