HP ProBook 4435s Notebook-PC - Manual (Page 57)

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 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 functioning properly.
● If the power lights remain off, the AC adapter is not functioning and should be replaced.
Contact technical support for information on obtaining a replacement AC power adapter.
Using external AC power 47