Lenovo ThinkCentre M76, Hardware Maintenance Manual, Page: 207 / 214

2. Remove or open the computer cover. For machine types 3114, 3121, 3123, and 3127, see “Removing
the computer cover” on page 78. For machine types 3120, 3122, 3126, and 3128, see “Opening the
computer cover” on page 119.
3. Locate the Clear CMOS /Recovery jumper on the system board. See “Locating parts on the system
board” on page 76.
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 or close the computer cover and reconnect the power cords for the computer and monitor. For
machine types 3114, 3121, 3123, and 3127, see “Completing the parts replacement” on page 110. For
machine types 3120, 3122, 3126, and 3128, see “Completing the parts replacement” on page 157.
8. Turn on the computer and then insert the POST and BIOS update (flash update) disc into the optical
drive. The recovery session begins. The recovery session will take two to three minutes. During this
time, you will hear a series of beeps.
9. After the recovery session is completed, there will be no video, the series of beeps will end, and the
system will automatically turn off.
10. Repeat step 1 through step 4.
11. Move the jumper back to the standard position (pin 1 and pin 2).
12. Reinstall any parts and reconnect any cables that have been removed or disconnected.
13. Reinstall or close the computer cover and reconnect power cords and all other external cables. For
machine types 3114, 3121, 3123, and 3127, see “Completing the parts replacement” on page 110. For
machine types 3120, 3122, 3126, and 3128, see “Completing the parts replacement” on page 157.
14. Turn on the computer and remove the disc from the optical drive.
Power management
Power management reduces the power consumption of certain components of the computer such as the
system power supply, processor, hard disk drives, and some monitors.
Advanced Configuration and Power Interface (ACPI) BIOS
Being an ACPI BIOS system, the operating system is allowed to control the power management features
of the computer and the setting for Advanced Power Management (APM) BIOS mode is ignored. Not
all operating systems support ACPI BIOS mode.
Automatic Power-On features
The Automatic Power-On features within the Power Management menu allow you to enable and disable
features that turn on the computer automatically.
• RTC resume : You can specify a date and time at which the computer will be turned on automatically.
This can be either a single event or a daily event.
• Wake on LAN : If the computer has a properly configured token-ring or Ethernet LAN adapter card that is
Wake on LAN-enabled and there is remote network management software, you can use the Wake on LAN
feature. When you set Wake on LAN to
Enabled , the computer will turn on when it receives a specific
signal from another computer on the local area network (LAN).
Chapter 11
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Additional service information
203