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Bofferbrauer2 said:
CladInShadows said:

That's common. The easiest way to fix it is replace the 72 pin connector (which I just did a couple weeks ago).

Where can you get one of those?

I got mine on Amazon. Just search for NES 72 Pin Connector. You might also be able to find one at a local retro game store.

Just make sure that the connector is the problem. If you're getting the red blinking light when you have a game in the system pushed down, it's probably the connector. The NES is notorious for having bent pins on that original connector because of having to push the cart down. So it's likely the pins are bent or dirty or both. Some people manually bend the pins back, some people even boil the connector. I decided to just get a new one because they're not expensive, and any kind of repair job requires that you open up your NES regardless. No soldering or anything. Just getting to the old connector by taking out parts and layers, taking the old one out, putting in the new one, and then putting everything back in the way you found it.

If you have a different issue, then I don't know enough to help.