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Verify UltraBay Slim Device connector is clean, not damaged and connected properly.
Remove the UltraBay Slim Device to inspect and assure the UltraBay Slim Device is clean and not damaged. See pg 74, or as noted in the PDF reader as pg 80, 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 UltraBay Slim Device making sure the connection is properly seated.