IBM H Series Installation And Service Manual page 226

Power-On Password: Setting a power-on password helps protect information stored
in your computer. If a power-on password is set for your computer, the Power On
icon is shown in the locked position; if a power-on password is not set, then the
Power On icon is shown in the unlocked position (as in the screen above).
When you select the Entry icon, a screen with eight empty boxes appears. Type
your password in these boxes. You can use any combination of up to eight charac-
ters (A–Z, a–z, and 0–9) for your password. As you type a character, a key appears
in the box.
Enter Password
Press Enter when you are finished; you are required to type the password again for
verification.
Verify Password
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RS/6000 Enterprise Server Model H Series Installation and Service Guide