Hey guys, I just did the disable lockout chip mod for my NES in hopes that it would fix the problem, it did make it where the games start up MUCH easier, but some of them still don't work properly. Operation Wolf will start up fine, but as soon as I press the trigger it freezes up. Also Super Mario/Duckhunt does something similar, the Duckhunt part works fine but when trying to play Mario the screen freaks out about half way through the first stage. Excitebike works 100% perfect, so it's not the NES. Should I just try to buy new carts or is there a better method to clean the contacts (some of them have a rust-like substance on them). I have been afraid to try polishing them without asking for a more proven method, but alcohol won't take the rust-like stuff off. Any suggestions appreciated!