Okay, so I bought an NES that came with Super Mario Bros. 3. It worked fine. Then I put in my other game that I had (Excitebike) and it stopped working. So I bought a new 72-pin connector and got it working again, I cleaned all the cartridges this time and put the new connector in. Mario worked but looked glitchy. Then I tried Excitebike. It stopped the NES from working again. I should add that the lockout chip was cut (I did it), but that was after the first time I tried it. Someone please help me.