When you say the 20s method, actually you have to disconnect the battery and adapter and press and hold down the power button for 30 seconds. Then reconnect everything and try again. If that does not help then either the battery needs replacing, the adapter is faulty, the DC jack needs replacing, or a problem exists on the MB charging circuit. Try another Dell adapter, also look to see if the centre pin in the DC jack is bent or missing.
My dell G15 went low on battery so I plugged it on it's charger, it ran out of battery and does not charge. Tried the 20s button press method, nothing I could find works, please help.
My Dell G15 has no charge and is not charging