Lenovo 20JW, User Manual, Page: 105 / 176

Solution : Machine UUID is invalid. Have the computer serviced.
• Message : Fan error
Solution : Cooling fan has failed. Shut down the computer immediately and have the computer serviced.
• Message : Thermal sensing error
Solution : The thermal sensor has a problem. Shut down the computer immediately and have the
computer serviced.
• Message : Error: The non-volatile system UEFI variable storage is nearly full.
Note: This error indicates that the operating system or programs cannot create, modify, or delete data in
the non-volatile system UEFI variable storage due to insufficient storage space after POST.
The non-volatile system UEFI variable storage is used by the UEFI BIOS and by the operating system
or programs. This error occurs when the operating system or programs store large amounts of data
in the variable storage. All data needed for POST, such as BIOS setup settings, chipset, or platform
configuration data, are stored in a separate UEFI variable storage.
Solution : Press F1 after the error message is displayed to enter ThinkPad Setup. A dialog asks the user
for confirmation to clean up the storage. If the user selects “Yes”, all data that were created by the
operating system or programs will be deleted except global variables defined by the Unified Extensible
Firmware Interface Specification. If the user selects “No”, all data will be kept, but the operating system or
programs will not be able to create, modify, or delete data in the storage.
If this error happens at a service center, Lenovo authorized service personnel will clean up the non-volatile
system UEFI variable storage using the preceding solution.
Beep errors
Lenovo SmartBeep technology enables you to decode beep errors with your smartphone when a black
screen occurs with beeps from your computer. To decode the beep error with Lenovo SmartBeep
technology, do the following:
1. Go to http://www.support.lenovo.com/smartbeep or scan the following QR Code.
2. Download the proper diagnostic app and install it on your smartphone.
3. Run the diagnostic app and place the smartphone near the computer.
4. Press the Fn key on your computer to emit the beep again. The diagnostic app decodes the beep error
and shows possible solutions on the smartphone.
The following section describes some beep errors and the corresponding solutions.
Note: Do not attempt to service a product yourself unless instructed to do so by the Customer Support
Center or product documentation. Only use a Lenovo-authorized service provider to repair your product.
Chapter 7
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Troubleshooting computer problems
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