I had the board (M1VB) working fine with an Ad725 setup, then I added the 5v sound mod and lost all video including hatch screen. I replaced the Ad725 with a fresh one and added Svideo port and still I have nothing. I am powering the whole board with 5v 2amp power supply which should be enough even with the added sound. Any thoughts on what blew up? I have good fuses and 5 volts going to the board and the video mod.