Dell PowerEdge 750 - Manual (Page 5)

The existing passwords are not disabled (erased) until the system boots with the password jumper plug removed. However, before you assign a new
system and/or setup password, you must install the jumper plug.
6. Turn off the system, including any attached peripherals, and disconnect the system from the electrical outlet.
7. Open the system.
8. Install the password jumper plug.
See Figure A -2 to locate the password jumper on the system board.
9. Close the system, reconnect the system to the electrical outlet, and turn on the system.
10. Assign a new system and/or setup password.
To assign a new password using the System Setup program, see "Using the System Setup Program" in your User's Guide.
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NOTE: If you assign a new system and/or setup password with the jumper plug still removed, the system disables the new password(s) the next
time it boots.