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by eof 5203 days ago
From the users stand point; it just gets jumpy; and your input doesn't match the output.

http://www.youtube.com/watch?v=8ak20j48w1A

If you have ever used a non-laser tracking mouse on a wood surface you have a good idea of what its like.

What appears to be happening is that there is a short from the output of the touchpad to the motherboard. Removing the little piece of foil that appears to be 'grounding' the trackpad from the screw 100% fixed it (for me).