Lenovo ThinkStation C20x 4269 Hardware Manual page 243

2. Unplug all power cords from electrical outlets, and unplug any external
options from the computer, including the USB mouse and the USB keyboard,
if they are connected. Open the computer cover. See "Opening the cover" on
page 94.
3. Access the system board. See "Accessing system board components and
drives" on page 96.
4. Locate the Clear CMOS/Recovery jumper on the system board. See "System
board connectors and components" on page 93.
5. Remove any cables that impede access to the Clear CMOS/Recovery jumper.
6. Move the jumper from the standard position (pins 1 and 2) to pins 2 and 3.
7. Reinstall the adapter cards (some models).
8. Close the computer cover and reconnect any cables that were disconnected.
9. Reconnect the power cords for the computer and monitor to electrical outlets.
10. Insert the POST/BIOS update (flash) diskette into drive A, and turn on the
computer and the monitor.
11. The recovery session will take two to three minutes. During this time you will
hear a series of beeps. After the update session is completed, there will be no
video, the series of beeps will end, and the system will automatically turn off.
Remove the diskette from the diskette drive.
12. Repeat steps 2 through 5.
13. Replace the Clear CMOS/Recovery jumper to its original position.
14. Reinstall the adapter cards (some models) if removed.
15. Close the computer cover and reconnect any cables that were disconnected.
16. Turn on the computer to restart the operating system.
Chapter 12. Additional Service Information
237