I have a TRS-80 and it powers up find, but when I turn the power button on with a game inserted it only displays a green, boxed in screen. I've cleaned the carts and tried to clean the pins. When I insert the cart into the slot and remove it about forty times, the cart is VERY dirty. I clean and repeat, but still, I can't get it to play a game.
Please HELP!!! Any advice would be great!