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Get a 3.8mm security bit and clean all the games with Weimans stove top cleaner. Not nuch, just a little, then clean it off with something afterwards. Then, you might want to take the sysytem apart down to the connector and scrub the connector just to make sure it's as clean as possible. And, lastly disable the lockout chip so it won't blink. After that, you'll be as good as the original.

Yeah, other than making sure the contacts on your games are clean, disabling the lockout chip inside usually fixes the flashing red light problem.

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Replace the 72-bit pin connector.

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Replacement pin connectors are nortorious for being far too tight. I had the same problem as you when I bought my NES. What I did was buy another NES that did not have its connector replaced. I then boiled its connector in water and now everything is fine. I'd ask the seller for a partial refund and if he does not comply, give a negative. 

If its really tight, when you put the games in, push them in but don't click them down, Sometimes that works. You could also contact the seller.

If the pins are extremely tight, the seller either messed up refurbing the old connector, or put in a really crappy replacement connector. The new batch of connectors on ebay are complete crap... one of my buddies own a shop and buys connectors all the time. He has stopped buying them, due to them not working properly and overall poor build quality. The last one I bought was literally useless...

If you want to return it, I would contact the seller and tell him/her that you are having problems. Try to treat it as an innocent mistake and see what happens. If you can't get anywhere with him/her, file a claim with ebay and see if you can get your money back.

If you want to keep the NES, see if the seller will do a partial refund. If you can't get anywhere with him/her, file a claim with ebay and see if you can get your money back.

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Lol, found it

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I found it also, via google.

Yes, I would be pissed, especially if you paid his asking price. I strongly suggest trying to return it, and buying stuff from the seller "nes_headquarters" if you want to buy from a "store". I bought my NES and around 30 games from him. The games were all spotless, clean pins, and the system worked fine. Shipped well and replies very fast to questions.

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Contacted him re a refund, going to cost me £50 to ship it back, kind of put me off buying anything in future from there.

Also, those hard to get out connectors, called Ninja Grips, are the absolute best when you break them in. Most people who say they're shit push their games down and fuck them up because they're so tight to begin with it kills it. You should not push any game down. I dunno what you guys are talking about but if you overpaid, boo.

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There are no local options for a NES?

My friend may still have a few spare systems that I helped clean up. I can ask.

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Have you tried not pushing down the games as has been suggested a couple times yet?

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Take it apart and look at your 72 pin. Maybe there is some hair in there or other foreign object. It could also not be installed properly, especially if it is one of those cheap knock of 72 pin. Or maybe just really dirty.

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It would be really hard to screw up a NES when you take it apart. You'd have to drop it and then stomp on it a few times for anything to go wrong. They are very easy to disassemble and only require a phillips screw driver.