.Luke, on 05 June 2016 - 05:44 PM, said:
It wouldn't happen to be rust, would it? I had that problem on an NES cart of Super Mario Bros once, but it didn't stop the cartridge from working as long as the pins were otherwise clean.
As a last resort, do you have a multimeter handy? If there are any capacitors on the PCB, it couldn't hurt to check those. In my experience, I could be wrong, caps are sometimes the first kinds of components to die, get damaged, or explode.
Don't have a multimeter, and I wasn't sure if it was rust or not. It didn't have that reddish tint to it, and some of it was coming off, so I thought it was dirt. The whole outside of the cart was pretty dirty, actually, so I wasn't too surprised that the inside had some grime as well.
But that doesn't matter much now as I'm proud to say I got it working! I picked up some 91% isopropyl alcohol and used that on the dirty part of the frame (which didn't do much) and then on the contact pins (which seemed to work better than the 70%). Dried the pins with a dry Q-tip, reassembled the cart, waited a bit, plugged it in, turned the N64 on... success! Now I just need to get a box for the game, and possibly a new cart label too (the one on there now is kinda dirty and faded).