Lenovo 20JD, User Manual, Page: 105 / 150

3. Reconnect the ac power adapter, and then turn on the computer.
4. If the power adapter icon still is not displayed in the Windows notification area, have the ac power
adapter and your computer serviced.
Power problems
Print these instructions now and keep them with your computer for reference later.
• Problem : My computer is getting no power at all.
Solution : Check the following items:
1. Verify the power button. The power button is illuminated whenever the computer is on.
2. Check all power connections. Remove any power strips and surge protectors to connect the ac
power adapter directly to the ac power outlet.
3. Inspect the ac power adapter. Check for any physical damage, and ensure that the power cable is
firmly attached to the adapter brick and the computer.
4. Verify that the ac power source is working by attaching another device to the outlet.
• Problem : My computer does not run on battery power.
Solution : Check the following items:
1. If the battery runs out of power, attach the ac power adapter to recharge the battery.
2. If the battery is charged but the computer does not run, contact Lenovo to replace the battery
with a new one.
• Problem : The system does not respond, and I cannot turn off the computer.
Solution : Turn off the computer by pressing and holding the power button for four seconds or more. If
the system still does not respond, remove the ac power adapter. Then reset the system by inserting a
straightened paper clip into the emergency-reset hole.
Power button problem
Problem : The system does not respond, and I cannot turn off the computer.
Solution : Turn off the computer by pressing and holding the power button for four seconds or more. If
the system still does not respond, remove the ac power adapter. Then reset the system by inserting a
straightened paper clip into the emergency-reset hole.
Boot problems
Print these instructions now and keep them with your computer for reference later.
• Problem : I receive an error message before the operating system loads.
Solution : Follow the appropriate corrective actions for power-on self-test (POST) error messages.
• Problem : I receive an error message while the operating system is loading the desktop configuration
after the POST is completed.
Solution : Find solutions by searching for the error message at the following Web sites:
– http://www.lenovo.com/support
– https://support.microsoft.com/
Sleep and hibernation problems
• Problem : The computer enters sleep mode unexpectedly.
Chapter 7
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Troubleshooting computer problems
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