Just fixed my Nintendo after it got the purple screen of death. This is usually due to a bad connection with the game cartridge so after cleaning both of the connectors to no avail I decided to replace the one inside the system. I got a new one off of eBay for 10$ and the whole process took less than 40 min. Stay tuned for an article/tutorial if you want to do this yourself and rescue your old system. If your Nintendo just outputs a purple screen or flashes the red light when a game is inserted this is most likely the cause. A quick fix is to just clean both of the connectors with rubbing alcohol or some other solvent, you can also use a Scotch bright pad to get the patina off the connecting pads, but if that doesn't help you will most likely need to do this.