Power Problems; A Power Button Problem - Lenovo ThinkPad L450 User Manual
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Note: If you are using the Windows 7 operating system, to display the power adapter (power plug) icon, click
Show hidden icons in the Windows notification area.
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.
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 make sure 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.
5. Remove all devices and then test for system power with minimal devices attached.
a. Disconnect the ac power adapter and all cables from the computer.
b. Close the computer display, and turn the computer over.
c. Remove the battery. Refer to "Replacing the battery" on page 119.
d. Remove the memory module. Refer to "Replacing a memory module" on page 137.
e. Remove the hard disk drive or hybrid drive. Refer to "Replacing the internal storage drive" on
page 129.
f. Wait for 30 seconds, and then reinstall the memory module and the known good battery or the ac
power adapter to test the computer with minimal devices attached first.
g. Reinstall each device one at a time that you have removed in the earlier steps.
If your computer does not run on battery power, check the following items:
1. Remove and reseat the battery to make sure that it is properly connected. Refer to "Replacing the
battery" on page 119.
2. Swap batteries with another similar model, if available.
If another similar ThinkPad model is available, then verify that the battery works in the other computer
and that the battery for the other model works in this computer.
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 4 seconds or more. If the
system is still not reset, remove the ac power adapter and the battery.
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 POST error messages.
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 homepage at http://support.microsoft.com/ and search for the
error message.
.
Chapter 8
Troubleshooting computer problems
103
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