Amis Kenneth wants answers to this question
this thing is very very old. most are in the land fill ,
15 years old.
try the coin cell trick yet, Pulled and big battery out first.
both batteries out. and AC pack fulled
push power button 10seconds or 3 times for 3 secends.
let PC reset for 1 your.
back COIN , then AC pack and leave the useless or WORSE
antic huge battery out of PC and test the PC now.
if that fails, try, same words you used on YT (youtube)
IBM thinkpad R51 BIOS password,
or read the manual, RTM? the power on PW is covered.
here, page 33. and more.
https://www.manualslib.com/manual/92006/Lenovo-Mt-1871.html?page=33&term=pass&selected=14
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