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#11
Assuming hardware has not a problem, it might be the manufacturer's trick to block unknown chargers. If you try a non-Dell power supply on a Dell notebook, then it will allow you to switch on and use the device while powered, but it will not charge the battery! Only a genuine Dell charger (with appropriate Watt rating) will also charge the battery. This is a well known Dell trick to force you buy a genuine Dell adapter. As far as I know this doesn't apply to HP or other brands, so I would suspect a broken power socket or dead battery. Your local computer service should be able to diagnose the problem and fix it for a reasonable price.