How do i fix my instant polaroid camera it just stoped working it is old do i need a new one

Those cameras run on integral film cassettes which contain the film and the battery. If you have a working cassette in your camera and it does not work then it is likely to be a battery problem. In which case you need a new cassette(long discontinued and are quite expensive). If your cassette is fine, then your camera is broken(less than 5% probability, these cameras don't brake on their own). In which case, there is nothing you can do but get a new one on eBay or Amazon. Like I said, these cameras don't just stop working, they are built to last for centuries(i still use Land cameras from 1950'). Do not throw your camera away, though, As it may still have a chance to be used again. The Impossible Project is attempting to make a new integral film cassette for 600 Model Polaroids which will be fresh and of similar quality to discontinued Polaroid 600 film. Should be any day now.