I think that maybe your graphics card is fried or some fuse in the mac was tripped and causing this issue. If this under warranty send it back and get a replacement. If you do not have this under warranty find a reliable repair shop to fix this as fixing this your self would cost to much time and money. If this mac book has nothing work keeping on it, just buy a new one as it is not worth trying to revive an old laptop that will have more problems in the future.