1.Turn off the computer.

2.Make sure that the over-discharged battery pack is in the computer.

3.Connect the ac power adapter to the computer and let it charge.

If the optional Quick Charger is available, use it to charge the over-discharged battery pack.

If the battery pack cannot be fully charged in 24 hours, use a new battery pack.

•Problem: Your computer shuts down before the battery status indicator shows empty, -or-Your computer operates after the battery status indicator shows empty.

Solution: Discharge and recharge the battery pack.

•Problem: The operating time for a fully charged battery pack is short.

Solution: Discharge and recharge the battery pack. If your battery's operating time is still short, use a new battery pack.

•Problem: The computer does not operate with a fully charged battery pack.

Solution: The surge protector in the battery pack might be active. Turn off the computer for one minute to reset the protector; then turn on the computer again.

•Problem: The battery pack cannot be charged.

Solution: You cannot charge the battery when it is too hot. If the battery feels hot, remove it from the computer and allow it to cool to room temperature. After it cools, reinstall it and recharge the battery. If it still cannot be charged, have it serviced.

AC power adapter problems

•Problem: The ac power adapter is connected to the computer and the working electrical outlet, but the power adapter (power plug) icon is not displayed in the task bar. Also the ac power indicator does not light up.

Solution: Do as follows:

1.Make sure that the connection of the ac power adapter is correct. For connecting the ac power adapter, see the Setup Instructions manual included in the shipping contents of your computer.

2.If the above step is correct, turn off the computer, then disconnect the ac power adapter and uninstall the main battery.

3.Reinstall the battery and reconnect the ac power adapter, then turn on the computer.

4.If the power adapter icon still does not appear on the task bar and the ac power indicator does not light up, have the ac power adapter and your computer serviced.

Note: If your computer is a Windows 7 model, to display the power adapter (power plug) icon, click Show hidden icons in the task bar.

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 switch. Refer to “System-status indicators” on page 14. The power switch 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 make sure that the power cable is firmly attached to the adapter brick and the computer.

252User Guide

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Lenovo 4242X04, NVS-4200M, 42825BU, 42421A0 manual AC power adapter problems, Power problems
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4242X04, NVS-4200M, 42421A0, 42825BU specifications

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