Motorcity

Hello. This is my first post, what a great site! I am having problems with an Intellivision I console I recently purchased. After inserting the cart and powering up I get a black screen on the TV. When the reset button is pushed, the game appears to be fine. I was worried about the blank screen of death, so I played the game for an hour or so with no issues. I tested all 16 games and had the same result. After reading posts with similar issues I cleaned all the carts and unit pins. I also adjusted the positioning of the carts with no luck. Any advise or help would be greatly appreciated. The system is in great cosmetic shape and I would hate to toss it. The controllers work flawlessly. Jeremy