IBM x3550 M4 Type 7914 Installation And Service Manual page 130

Figure 84. System-board switches, jumpers, and buttons
Attention: Before you change any switch settings or move any jumpers, turn
off the server; then, disconnect all power cords and external cables. See the
safety information that begins "Safety" on page vii. Do not change settings or
move jumpers on any system-board switch or jumper blocks that are not shown
in this document.
While the server is turned off, move power-on password switch (switch 4) on
the system board switch block (SW3) to the On position to enable the power-on
password override. You can then start the Setup utility and reset the power-on
password. You do not have to return the switch to the previous position.
The power-on password override switch does not affect the administrator
password.
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IBM System x3550 M4 Type 7914: Installation and Service Guide