Look at the following steps to troubleshoot the issue:

1. Check the power adapter, battery, and power cable for any physical damages.
2. Troubleshoot the power adapter by using it on a different device.
3. Check your power settings to make sure that the laptop is set to charge when plugged into an outlet.
4. Clean the charging port on the laptop and the charging head.
5. Check the charging cord and try using a different one.
6. Ensure that the power socket you are using is properly functional.
7. Try using a different power outlet altogether.
8. Reset the laptop's power system.
9. Replace the battery if the issue still persists.