Lenovo 278182U - IdeaPad Y430 Dual Core T3400 2.16 GHz, User Manual, Page: 65 / 150

Chapter 4. Troubleshooting
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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 mode (the sleep indicator turns on)
immediately after Power-on self-test (POST).
Make sure that:
ƒ
The battery is charged.
ƒ
The operating temperature is within the acceptable range. See
“Specifications” on page 114.
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.
The battery power is getting low. Connect the AC adapter to the
computer, or replace the battery with a fully charged one.
The computer does not return from sleep mode, or the sleep
indicator stays on and the computer does not work.
If the computer does not return from sleep mode, it may have entered
hibernation mode automatically because the battery is depleted. Check
the sleep indicator.