Lenovo IdeaPad Y560 Lenovo IdeaPad Y560 UserGuide V1.0 - Page 63
Troubleshooting, Keyboard problems, Sleep or hibernation problems, Power-on self-test POST.
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Chapter 5. Troubleshooting Keyboard problems A number appears when you enter a letter. • The numeric lock function is on. To disable it, press Fn+F8. Sleep or hibernation problems The computer enters sleep mode unexpectedly. • 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. The computer enters sleep • Make sure that: mode immediately after Power-on self-test (POST). - The battery is charged. - The operating temperature is within the acceptable range. See "Appendix B. Use and care information" on page 71. Note: If the battery is charged and the temperature is within range, have the computer serviced. The critical low-battery error • The battery power is getting low. Connect the AC message appears, and the adapter to the computer, or replace the battery with computer immediately turns a fully charged one. off. 49