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Verify Palm Rest Connectors are clean, not damaged and connected properly.
Remove the Palm Rest connector to inspect and assure the Palm Rest connectors are clean and not damaged. See pg 89-90, or as noted in the PDF reader as pg 95-96, of the "thinkpad t40 t40p t41 t41p t42 t42p Maintenance Manual" for more details if needed. This manual is found in the Attached Documents section at the end of this Guide.
Insert and reconnect the Palm Rest connector making sure the connection is properly seated.