Originally Posted by
MarioKartMonk
Sounds like your systems cart pin connector is dirty and/or loose. Depending on the version of the SNES that you have, you may be able to easily swap in a new connector. Otherwise you will have to clean each pin using a credit card wrapped in white paper towel soaked in rubbing alcohol, and then you will have to bend each pin, using a small screw driver, to make it more tightly hold its connection with the cart. It is about 30 minutes of work, and you will need to open up the SNES to do it.