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c. Stop the battery discharge. Refer to Before replacing CRU.
d. Remove the memory (SO-DIMM). Refer to Replacing memory.
e. Remove the PCI Express Mini Card. Refer to Replacing the PCI Express Mini Card for wireless
LAN/WiMAX connection.
f. Remove the hard disk drive and solid state drive. Refer to Replacing the hard disk drive or solid
state drive.
g. Wait for 30 seconds, and then reinstall the SO-DIMM and the known good battery or the ac power
adapter to test the computer with minimal devices attached rst.
h. Reinstall each device one at a time that you have removed in the earlier steps.
If your computer does not run on battery power, do the following:
1. If the battery runs out of power, attach ac power adapter to recharge the battery.
2. If the battery is charged but the computer does not run, call Lenovo Customer Service Center to have
it serviced.
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.
Startup 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, check the following item:
• Follow the appropriate corrective actions for Power-on self-test listed in Error messages.
If you receive an error message while the operating system is loading the desktop conguration 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. Visit 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 processor overheats, the computer automatically enter sleep mode to allow the computer
to cool and to protect the processor and other internal components. Check the settings for sleep mode,
using Power Manager.
• Problem: The computer enters sleep mode (the sleep indicator turns on) immediately after Power-on
self-test.
Solution: Make sure that:
– The battery is charged.
– The operating temperature is within the acceptable range. Refer to Features, Specications, and
Operating environment.
If the battery is charged and the temperature is within range, have the computer serviced.
• Problem: An error message is displayed indicating a critical low-battery error and the computer
immediately turns off.
138 User Guide