Erasing Lost Or Forgotten Passwords (Clearing Cmos); Enabling Or Disabling A Device - Lenovo ThinkCentre M91 Hardware Maintenance Manual

Note: A password can be any combination of up to 64 alphabetic and numeric characters. For more
information, see "Password considerations" on page 42.

Erasing lost or forgotten passwords (clearing CMOS)

This section provides instructions on how to erase lost or forgotten passwords, 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 72.
3. Locate the Clear CMOS /Recovery jumper on the system board. See "Locating parts on the system
board" on page 71.
4. Move the jumper from the standard position (pin 1 and pin 2) to the maintenance position (pin 2 and
pin 3).
5. Close the computer cover and connect the power cord. See "Completing the parts replacement"
on page 98.
6. Turn on the computer and leave it on for approximately 10 seconds. Then, turn off the computer by
holding the power switch for approximately five seconds.
7. Repeat step 1 through step 2.
8. Move the Clear CMOS /Recovery jumper back to the standard position (pin 1 and pin 2).
9. Close the computer cover and connect the power cord. See "Completing the parts replacement"
on page 98.

Enabling or disabling a device

This section provides information on how to enable or disable user access to the following devices:
USB Setup
SATA Controller
External SATA Port
To enable or disable a device, do the following:
1. Start the Setup Utility program. See "Starting the Setup Utility program" on page 41.
2. From the Setup Utility program main menu, select Devices.
3. Depending on the device you want to enable or disable, do one of the following:
• Select USB Setup to enable or disable a USB device.
• Select ATA Drive Setup to enable or disable an internal or external SATA device.
4. Select the desired settings and press Enter.
5. Press F10 to save and exit the Setup Utility program. See "Exiting from the Setup Utility program"
on page 45.
Use this option to enable or disable a USB connector. When a USB connector is
disabled, the device connected to the USB connector cannot be used.
When this feature is set to Disable, all devices connected to the SATA connectors
(such as hard disk drives or the optical drive) are disabled and cannot be accessed.
When this option is set to Disable, the device connected to the External SATA
connector cannot be accessed.
.
Chapter 6 Using the Setup Utility program
43