Actually, about using isopropyl alcohol on cartridge connectors, it's good but not always enough. Old consoles can have oxidation that just wiping won't fix. For a better clean, try gently rubbing the pins with a pencil eraser first to scrape off that gunk. Then use the alcohol to wipe away any leftover bits. Another simple fix is opening up cartridges to clean the contacts inside, which often get dirty too. Just take your time and use the right tools so you don't break anything lmao.