Beep Errors; Memory Module Problems; Networking Problems; Ethernet Problems - Lenovo ThinkPad Yoga 12 User Manual

• Message: 2201: Machine UUID is invalid.
Solution: Machine UUID is invalid. Have the computer serviced.
• Message: Fan error
Solution: Cooling fan has failed. Have the computer serviced.
• Message: Thermal sensing error
Solution: The thermal sensor is not functioning correctly. Shut down the computer immediately and
have the computer serviced.

Beep errors

Table 6. Beep errors
Problem
One short beep, pause, three short beeps, pause, three
more short beeps, and one short beep
Three short beeps, pause, one short beep, pause, one
more short beep, and three short beeps
One long and two short beeps
Four cycles of four short beeps
Five short beeps
Five short beeps, pause, five short beeps, and pause

Memory module problems

Print these instructions now and keep the instructions with your computer for reference later.
If your memory module is not operating properly, check the following items:
1. Check for error messages during startup.
Follow the appropriate corrective actions for power-on self-test (POST) error messages.
2. Verify that the latest UEFI BIOS for your model has been installed.
3. Verify the proper memory configuration and compatibility including the maximum memory size and the
memory speed.
4. Run the Lenovo Solution Center program.

Networking problems

The following are the most common networking problems:

Ethernet problems

• Problem: The computer cannot connect to the network.
Solution: Ensure that:
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User Guide
Solution
Memory problem. Shut down the computer immediately
and have the computer serviced.
PCI resource problem. Shut down the computer
immediately and have the computer serviced.
Video problem. Shut down the computer immediately and
have the computer serviced.
TCG*-compliant functionality-related problem (might
be the BIOS code validation failure). Shut down the
computer immediately and have the computer serviced.
* TCG is the abbreviation for Trusted Computing Group.
System board problem. Shut down the computer
immediately and have the computer serviced.
TCG-compliant functionality-related problem (might be
the TPM initialization failure). Continue with the boot
process and call the Lenovo service center for technical
support.