See if this helps, first off try a different cart to see if it's the connector pins or just the cart itself. If it's the cart you'll need to get some q-tip and some alcohol and clean the cartridge until no more dirt is visible on the q-tip. If it's the pin connectors try taking a credit card, wrap some paper towel around it and clean it with alcohol and really get in there. If that doesn't help then you might just need to get a new one, unless you are handy with electronic repair.