My niece's laptop will not charge from the adaptor & the blue indicator led is not lit when the mains adaptor is connected. It is giving an o/p of the required 19v when disconnected but I am not sure if it is being dragged down when connected. Does anyone know if this model has problems with the jack socket or is it more likely to need a new board, in which case is it worth repairing or is she looking at a new laptop? Many thanks.