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Erasing a lost or forgotten password (clearing CMOS)
This section provides instructions on how to erase a lost or forgotten password, such as a user password.
To erase a lost or forgotten password, do the following:
1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Open the computer cover. See “Opening the computer cover” on page 14.
3. Locate the Clear CMOS /Recovery jumper on the system board. See “Locating parts on the system
board” on page 10
.
4. Remove any parts and disconnect any cables that might prevent your access to the Clear CMOS
/Recovery jumper.
5. Move the jumper from the standard position (pin 1 and pin 2) to the maintenance position (pin 2 and
pin 3).
6. Reinstall any parts and reconnect any cables that have been removed or disconnected.
7. Reinstall the computer cover and reconnect the power cords for the computer and monitor. See
“Completing the parts replacement” on page 52
.
8. Turn on the computer and leave it on for approximately 10 seconds. Then, turn off the computer by
holding the power switch for approximately ve seconds.
9. Repeat step 1 through step 4.
10. Move the Clear CMOS /Recovery jumper back to the standard position (pin 1 and pin 2).
11. Reinstall any parts and reconnect any cables that have been removed or disconnected.
12. Close the computer cover and reconnect all cables. See “Completing the parts replacement” on page
52.
13. Turn on the computer. Your password has been erased and you can use the Setup Utility program to set
a new password. See Chapter 4 “Using the Setup Utility program” on page 61 for more information.
54 ThinkCentre User Guide