On the original Nintendo when you start them up the light would blink and sometimes the screen on the the tv would also blink. You may remember how kids would pull out the game cartridge and blow on the end of it and put back in to make it work.
The weak point on that system is the connector inside the console. This connector is easily replaced it just slides onto the "mother board". Replacement connectors(also known as a "pin connector") are available on ebay for about $10 plus shipping.
When I was selling I would buy a lot of 10 of the pin sets and get a little discount. The real key to fixing the problem is to use a little very fine sand paper on the mother board finger connector before sliding on the new pin connector. I used some 3000 grit wet sand paper and a little rubbing alcohol instead of water. This is not a time to do a lot of hard rubbing just gently remove the oxidation on those fingers. Of course you need to clean up with a paper towel. The oxidation and dirt will be almost black in color.(I know black is not a color)
After that the old Nintendo will work like new. I would also use Q-tips and rubbing alcohol to clean the connectors of the game cartridges. Rubbing alcohol has water in it so wait until the water evaporates before putting it into the game console.
For a guy who never enjoyed playing video games I know waaaaay toooo much about those old Nintendos. Mike
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