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Thinkpad 600 161 & 163 error (time & date) but locked out!?

My Thinkpad 600 has the standard error codes for time & date (161 &163)! After changing out the CMOS battery (which many times corrects this problem) and pressing F1, I still get the same error codes and a "locked out padlock" symbol! Seams to be an endless loop!
Kent Adams, December 2007
Try downloading a hardware maintenance manual from www.lenovo.com and following the diagnostic sequence.

It may have a BIOS password set.

t, December 2007
link Click here to see other fixes for Thinkpad.