If your computer is getting no power at all, check the following items:
1.Verify the power button. Refer to “System status indicators” on page 5. The red dot in the ThinkPad logo is lit 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 make sure that the power cable is firmly attached to the adapter brick and the computer.
4.Verify if the ac power source is working by checking the ac power status indicator. Refer to “Power status indicator” on page 7. The ac power status indicator is lit when ac is connected to the computer.
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 27.
d.Remove the memory module. Refer to “Replacing a memory module” on page 32.
e.Remove the PCI Express Mini Card. Refer to “Replacing a PCI Express Mini Card for wireless LAN connection” on page 29.
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 27.
2.Swap batteries with another similar model, if available.
If another similar ThinkPad model is available, then verify that the battery pack works in the other computer and that the battery pack for the other model works in this computer.
3.Verify the
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.
Sleep 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 (the sleep indicator turns on) immediately after the
Solution: Ensure that:
–The battery is charged.
–The operating temperature is within the acceptable range. Refer to “Operating environment” on page 10.
Chapter 5. Troubleshooting computer problems 49
