Dell Alienware Aurora R2 (Early 2010) - Manual (Page 114)

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CHAPTER 22: SYSTEM SETUP
Clearing Forgotten Passwords and CMOS Settings
Follow the instructions in “Before You Begin” on page 1. 6.
WARNING: The computer must be disconnected from the electrical
outlet to clear the CMOS setting.
Remove the left side-panel (see “Removing the Left Side-Panel” on page 2. 11).
Reset the current password and CMOS settings: 3.
Locate the 3-pin CMOS or password-reset jumper on the system board a.
(see “System Board Components” on page 14).
Remove the jumper plug from the CMOS or password-reset jumper
b.
pins 2 and 3.
Place the jumper plug on the CMOS or password-reset jumper
c.
pins 1 and 2 and wait for approximately five seconds.
Remove the jumper plug and replace it on the CMOS or password reset
d.
jumper pins 2 and 3.
CMOS: