do u live near another member who has a Revenge from Mars.

u could try your prism card and roms etc in their machine to see if it is any of your items other than the mother board.

u could isolate the prob this way to see if it is your motherboard or not. if you roms n prism card etc cause the other machine to play up, then you will know what is giving you problems. if u lived in QLD i would say come over n lets give it a go. !