IBM Thinkpad 755cx supervisor password

Try removing the cmos battery, or if under warranty have a dealer remove the battery. This should reset the cmos after several minutes.

There's a program called "wipeCMOS" at (http://geocities.com/sjwoolham/) haven't had a need to use it yet, but it sounds promising...

Found it at www.TinyApps.org

I cannot remember whether your system has the same procedure as that on the 770 I had while working for big blue.
On that system one cleared the password when prompted by entering the appropriate word when prompted and then adding a space. e.g. password = fredxx would be entered as fredxx? (where ? represents a space) Then one is free to remove the old disk and replace it.
I had to go through this a couple of times when putting the original HD back in before returning the PC to its owner.
If you have forgotten the password - you may be 'stuffed'. I remember former colleagues telling me that forgetting the password meant 'wrecking' the hard disk.
Have you scoured the IBM site for Password Reset documents? Maybe the one's I found wereonly inside their firewall.
Have you read your user manual?

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