There is a lot of SNES with black screen issue. For a long time now this is a well know failure but with no real fix (or explanation). On the web we can read about changing capacitors, clean the cartridge port but it's not the real solution. After some son experiments, I notice all these SNES have the same behavior. Neither game works, but with a few exceptions : - The flash cart from tototek display his menu when has more than 1 game installed on it. I can chose the game with gamepad but after pessing start I have a black screen or some screen flickering. - others cartridges with strange behavior is the Satelaview carts. The program run, I have the flipping Nintendo Logo with music but I can’t start anything. Why these carts display something while all others games simply show black screen ?