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Verify Hard Drive connections are clean, not damaged and connected properly.
Remove the Hard Drive to inspect and assure the Hard Drive connectors are clean and not damaged. See pgs 75-76, or as noted in the PDF reader as pgs 81-82, 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 Hard Drive making sure the connection is properly seated.