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Verify CMOS Battery Connectors are clean, not damaged and connected properly.
Remove the CMOS Battery connector to inspect and assure the CMOS Battery connectors are clean and not damaged. See pgs 106-109, or as noted in the PDF reader as pgs 112-115, 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 CMOS Battery connector making sure the connection is properly seated.