My OLD Dell latitude, a companion of many years appears to be no longer chargeable. i bought a new battery and new charger but that doesn't help. I always get the message that I am low on charge and to charge it up. Other than discarding it, is there something I am missing? I am thinking the motherboard for some reason has partially or largely died and the electrical function no longer works. Is there something else I could try before discarding the unit?