A "0197: Unauthorized CMOS change detected" POST error is observed on bootup.

After resolving the error by entering BIOS setup and saving changes, it may appear again at a later time. The error may also appear on systems which have not seen the error previously. No known configuration changes have been performed by the user.

Any of the following ThinkCentre systems:

• ThinkCentre A52 (type 8153, 8154, 8155, 8156, 8157, 8158, 8159, 8160, 8161, 8162, 8163, 8164, 8165, 8166, 8167
  8168, 8169, 8170)
• ThinkCentre M52 (type 8099, 8110, 8111, 8112, 8113, 8114, 8115, 8116, 8211, 8212, 8213, 8214, 8215, 9210, 9211)

Update the BIOS to the latest level. Download and install the most recent version of the BIOS.

You may see the error one final time on the first boot of the system subsequent to the update.