Dell Precision T3400 (Late 2007) - Manual (Page 96)

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Clearing Passwords and CMOS Settings
6 Connect your keyboard and mouse, then connect your computer and
monitor to electrical outlets and turn them on.
7 After the Microsoft Windows desktop appears on your computer, turn the
computer off.
NOTE:
Ensure that the computer is off and not in a power management mode.
If you cannot shut down the computer using the operating system, press and
hold the power button for 4 seconds.
8 Disconnect the keyboard and mouse, then disconnect the computer and
monitor from their electrical outlets.
9 Press the power button on the computer to ground the system board.
10 Remove the computer cover (see "Removing the Computer Cover" on
page 145).
11 Replace the 2-pin jumper plug onto pins 3 and 4 of the password
connector (RTCRST_PSWD) on the system board.
NOTE:
The password jumper plug must be reinstalled on the password
jumper pins in order to enable the password feature.
NOTICE:
To connect a network cable, first plug the cable into the network wall jack
and then plug it into the computer.
12 Connect your computer and devices to electrical outlets, and then turn
them on.
NOTE:
In System Setup (s ee "System Setup" on page 81 ) , both system and
administrator password options appear as Not Set. The password feature is
enabled, but a password is not assigned.
Clearing CMOS Settings
CAUTION:
Before you begin any of the procedures in this section, follow the
safety instructions located in the Product Information Guide.
1 Follow the procedures in "Before You Begin" on page 143.
NOTE:
The computer must be disconnected from the electrical outlet to clear
the CMOS setting.
2 Remove the computer cover (see "Removing the Computer Cover" on
page 145).