●
When writing information to a disc (select models only)
●
When running Disk Defragmenter on computers with internal hard drives
●
When performing a backup or recovery
When you connect the computer to external AC power:
●
The battery begins to charge.
●
The screen brightness increases.
●
The power meter icon on the Windows desktop changes appearance.
When you disconnect external AC power, the following events occur:
●
The computer switches to battery power.
●
The screen brightness automatically decreases to save battery life.
●
The power meter icon on the Windows desktop changes appearance.
Troubleshooting power problems
Test the AC adapter if the computer exhibits any of the following symptoms when it is connected to AC power:
●
The computer does not turn on.
●
The display does not turn on.
●
The power lights are o.
To test the AC adapter:
1. Shut down the computer.
2. Connect the AC adapter to the computer and to the power cord, and then plug the power cord into an AC
outlet.
3. Turn on the computer.
●
If the power lights turn on, the AC adapter is working properly.
●
If the power lights remain o, check the connection from the AC adapter to the computer and the
connection from the power cord to the AC outlet to be sure that the connections are secure.
●
If the connections are secure and the power lights remain o, the AC adapter is not functioning and
should be replaced.
Contact support for information about obtaining a replacement AC power adapter.
HP CoolSense (select models only)
HP CoolSense detects when the computer is not on a horizontal surface and adjusts performance and
fan settings to keep the surface temperature of your computer at the optimum level of comfort.
When HP CoolSense is o, the position of the computer is not detected and the performance and fan options
remain at the factory setting. As a result, the surface temperature of the computer may be higher than it
would be with HP CoolSense on.
28 Chapter 6 Managing power
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