My little brother was playing some game on a faulty card...I called sapphire and I was about to ship it to the RMA dept to get a replacement....Anyway, Hes playing a game and said the monitor turned off. ...So he restarts it and said it turned on for a few seconds and turned it off again...I swapped cards quickly, booted it up again and I hear sound but no picture...This is an old monitor I got ways back from Dell..>Flatscreen 19inch .....Is it done with...Or are the cards having problems...