HP ENVY m4-1002xx Notebook PC - Manual (Page 57)

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 off.
To test the AC adapter:
1. Shut down the computer.
2. Remove the battery from the computer.
3. Connect the AC adapter to the computer, and then plug it into an AC outlet.
4. Turn on the computer.
● If the power lights turn on, the AC adapter is working properly.
● If the power lights remain off, check the connection from the AC adapter to the computer
and the connection from the AC adapter to the AC outlet to make sure the connections are
secure.
● If the connections are secure and the power lights remain off, the AC adapter is not
functioning and should be replaced.
Contact customer support for information on obtaining a replacement AC power adapter.
Running on external AC power 47