Recently I bought a 5200 that wasn't working (boots to black screen) and was able to figure out (with some help) that two of the RAM chips were bad. After that, the console boots up, however both my controllers don't work. I've tried multiple games and even the Atarimax Ultimate SD Multicart. One thing I did notice is when the Atarimax Ultimate SD Multicart is running and listing all the games on it, I hear a repeating beeping noise. When I put in all the other games I hear no sound, although I'm not sure if there is any until the buttons are pressed.