I went to unscrew the back and noticed that a screw was missing where the ram is located so I popped it open and noticed there are two ram cards (I am not tech savvy so please bare with me) and they say Samsung on them. Is that normal? And could that be why only a could letter keys on either side of my keyboard are no longer working? I left my laptop around someone who was working on their notebook at my house and the next time I remember using my laptop was when the issue began.