Lenovo IdeaPad U165 User Manual page 56

Chapter 5. Troubleshooting
Sleep or hibernation problems
The computer enters sleep
mode unexpectedly.
The computer enters sleep
mode immediately after
Power-on self-test (POST).
Note: If the battery is charged and the temperature is within range, have the computer
serviced.
The critical low-battery error
message appears, and the
computer immediately turns
off.
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• If the processor overheats, the computer automatically
enters sleep mode to allow the computer to cool and to
protect the processor and other internal components.
Check the settings for sleep mode.
• Make sure that:
- The battery is charged.
- The operating temperature is within the acceptable
range. See "Appendix B. Use and care
information" on page 70.
• The battery power is getting low. Connect the AC
adapter to the computer, or replace the battery with
a fully charged one.