Thepower rating of the charger should be on the power brick (the largest part of the charger). If you have a removable battery, disconnect it, plug in the charger and see if you can run your PC. Plug in your charger and check if the LED indicator lights up. If not, check for any loose connections.
Afterinstalling Windows 10 on my HP Pavilion g6-2197sa laptop, I have had problems charging the battery. The battery icon reports something like "79% available (plugged in, not charging)." I can, sometimes, temporarily fix this problem by following these steps: Shut down; Remove battery; Boot up on AC power
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hp laptop charger plugged in but not charging