If blowing on the Metroid cart and shimmying it carefully into the system isn’t working for you anymore, don’t start looking to replace your old NES just yet. Retro Gaming Hacks author, Chris Kohler, published this video howto on repairing an old NES.
The 72 pin connector that the game cartridges plug into are notorious for becoming corroded and eventually failing. Thankfully, you can pick up a new connector for a few dollars and replace it easily using a phillips head screwdriver.
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