IBM B50 - Manual (Page 101)

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3. To disable the power-on password, move the jumper to the two rightmost pins.
4. Reinstall any adapters you have removed.
Note: To set the power-on password, the jumper must be in the default position
(on the two leftmost pins). You must also install all other options (such
as internal drives, memory, adapters) if you are planning to install them
now. After you have installed these options, replaced the covers, and
reinstalled your server in the rack, start the System Management
Services to set the power-on password. For more information on the
System Management Services, see Chapter 3, “Using System
Management Services.”
Chapter 4. Installing and Removing Options 4-9