Power Problems; A Power Button Problem - Lenovo ThinkPad X240 User Manual

Solution: Discharge and recharge the batteries. If your battery operating time is still short, call Lenovo
Customer Service Center.
• Problem: The computer does not operate with fully charged batteries.
Solution: The surge protector in the battery might be active. Turn off the computer for one minute to reset
the protector; then turn on the computer again.
• Problem: The batteries cannot be charged.
Solution: You cannot charge a battery when it is too hot. Turn off the computer and allow it to cool
to room temperature. After it cools, recharge the batteries. If the batteries still cannot be charged,
call Lenovo Customer Service Center.
This system supports only batteries specially designed for this specific system and manufactured
by Lenovo or an authorized builder. The system does not support unauthorized batteries or batteries
designed for other systems. If an unauthorized battery or a battery designed for another system is
installed, the system will not charge.
Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and
provides no warranties for failures or damage arising out of their use.
An ac power adapter problem
Problem: The ac power adapter is connected to the computer and the working electrical outlet, but the
power adapter (power plug) icon is not displayed in the Windows notification area.
Solution: Do the following:
1. Make sure that the connection of the ac power adapter is correct. For instructions on connecting the ac
power adapter, see Safety, Warranty, and Setup Guide that comes with your computer.
2. If the connection of the ac power adapter is correct, turn off the computer, then disconnect the ac
power adapter.
3. Reconnect the ac power adapter, 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 it with your computer for reference later.
If your computer is getting no power at all, check the following items:
1. Verify the power button. Refer to "Status indicators" on page 6. 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 the ac power source is working by attaching another device to the outlet.
If your computer does not run on battery power, check the following items:
1. If the batteries run out of power, attach ac power adapter to recharge the batteries.
2. If the batteries are charged but the computer does not run, call Lenovo Customer Service Center.

A power button problem

Problem: The system does not respond, and you cannot turn off the computer.
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User Guide