Need help please! My Samsung S3511 laptop shut down whilst using it when the battery ran out, when I plugged the charger in there was nothing, no lights came on, no sounds, nothing, completely dead! I've tried draining the power with the battery and charger disconnected, I've tried charging it with the battery out, I just don't know what is wrong with it, please advise (I am not tech savvy so please be gentle!!) Thank you