I'll summarize what I learnt while working on 3 different T4400, 2 of them being T4400C and 1 being a T4400SX (with a "last gen" plasma screen no less!)
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Remove password on a very retro Toshiba T4500
I expected it would be as easy as removing the batteries -- which is a must anyway on those old laptops because battery leaks are just another name for time bombs. Surprisingly for tech that old, the password doesn't seem to be stored in volatile memory. Let's dig!