Dell PowerEdge NM176 Hardware Owner's Manual page 126

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 6-1 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" on page 35.
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Jumpers and Connectors