3.
Plug the other end of the power cord into an AC outlet
(3)
.
Testing an AC adapter
Test the AC adapter if the computer exhibits any of the following symptoms when it is connected to AC
power:
●
The computer will not turn on.
●
The display does not turn on.
●
The power light is off.
To test the AC adapter:
1.
Remove the battery from the computer.
2.
Connect the AC adapter to the computer, and then plug it into an AC outlet.
3.
Turn on the computer.
If the power light turns
on
, the AC adapter is working properly.
Contact technical support for information on obtaining a replacement AC power adapter. Select
Start
>
Help and Support
>
Get assistance
.
Using battery power
When a charged battery is in the computer and the computer is not plugged into external power, the
computer runs on battery power. When the computer is plugged into external AC power, the computer
runs on AC power.
If the computer contains a charged battery and is running on external AC power supplied through the
AC adapter, the computer switches to battery power if the AC adapter is disconnected from the
computer.
NOTE:
The display brightness is decreased to save battery life when you disconnect AC power. To
increase display brightness, use the
fn+f4
hotkey or reconnect the AC adapter.
You can keep a battery in the computer or in storage, depending on how you work. Keeping the battery
in the computer whenever the computer is plugged into AC power charges the battery and also protects
your work in case of a power outage. However, a battery in the computer slowly discharges when the
computer is off and unplugged from external power.
58
Chapter 8 Power management
