Power Problems; A Power Button Problem - Lenovo ThinkPad X250 User Manual

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.
Solution: Turn off the computer by pressing and holding the power button for four seconds or more. If the
system is still not reset, remove the ac power adapter and reset the system by inserting one end of a needle
or a straightened paper clip into the emergency-reset hole. To locate the emergency-reset hole, refer
to "Bottom view" on page 6.
Boot problems
Print these instructions now and keep them with your computer for reference later.
If you receive an error message before the operating system loads, follow the appropriate corrective actions
for power-on self-test (POST) error messages. See "Error messages" on page 96.
If you receive an error message while the operating system is loading the desktop configuration after the
POST is completed, check the following items:
1. Go to the Lenovo Support Web site at http://www.lenovo.com/support and search for the error message.
2. Go to the Microsoft Knowledge Base home page at http://support.microsoft.com/ and search for the
error message.
Sleep and hibernation problems
• Problem: The computer enters sleep mode unexpectedly.
Solution: If the microprocessor overheats, the computer automatically enters sleep mode to allow the
computer to cool and to protect the microprocessor and other internal components. Check the settings
for sleep mode.
• Problem: The computer enters sleep mode immediately after the power-on self-test.
Solution: Ensure that:
– The batteries are charged.
– The operating temperature is within the acceptable range. Refer to "Operating environment" on page
12.
If the batteries are charged and the temperature is within range, have the computer serviced.
• Problem: A critical low-battery error occurs, and the computer immediately turns off.
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User Guide