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2. Insert the CD into the external optical drive.
3. Restart the computer.
4. When the logo screen is displayed, repeatedly press and release the F12 key. When the Boot Menu
window opens, release the F12 key.
5. Use the arrow keys to select ATAPI CDx (x: 0, 1, ...) and then press Enter. The diagnostic program will
be launched automatically.
6. Follow the instructions on the screen to use the diagnostic program.
Power system checkout
To verify if the batteries and the power adapter are functional, do the following:
1. Turn off the computer.
2. Connect the ac power adapter.
3. Turn on the computer. If the computer can be turned on, it means that either the battery or the ac power
adapter is functional.
4. Insert a straightened paper clip into the emergency reset hole to reset the computer. If the computer is
still powered on, it means that the ac power adapter is functional.
5. Turn off the computer.
6. Disconnect the ac power adapter and turn on the computer. If the computer can be turned on, it means
that the battery is functional.
If you suspect that the power problem is caused by a specific power device, refer to the appropriate
checkout item in the following list:
• "Checking the ac power adapter" on page 29
• "Checking operational charging" on page 29
• "Checking the coin-cell battery" on page 30
Checking the ac power adapter
Ensure that you use the ac power adapter that is shipped with the computer to provide enough power to the
computer.
Note: Noise from the ac power adapter does not always indicate a defect.
To check the ac power adapter, do the following:
1. Connect the computer to a power outlet and turn on the computer.
2. Check the adapter status from the following Lenovo programs:
• For Windows 10: Open the Lenovo Settings program and click Power.
• For Windows 7: Open the Power Manager program and click Battery.
If the ac power adapter is working well, adapter information will be displayed on the screen. If a message
is displayed warning that the power supply is not enough, replace the adapter with a proper one that is
supported by the computer. If you do not see any information about the adapter, replace the adapter
with a new one.
If the ac power adapter is working but the computer does not charge during operation, go to "Checking
operational charging" on page 29.
Checking operational charging
To check whether the batteries charge properly during operation, do the following:
1. Discharge the batteries until the remaining battery power is less than 50%.
.
Chapter 3
General checkout
29
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