sounds like it needs a recap. doesn't matter how flawless it is on the outside, these things all have rotten caps on the inside. once the video caps go bad you will not get any picture at all on the screen. its binary. either it works or it doesn't. there is no graceful degradation.
try putting a set of earphones in the jack. you should hear sound from the ear jack even if it doesn't have any from the external speaker. if you hear sound, the game is loading fine, its just the caps.