How to tell when a Genesis game has bit the dust

I've just recently bought some megadrive/Genesis games and so far haven't been able to get any of them to work. I notice that they fall into the following camps: (1) some have a greenish/greyish tinge in the contact area (2) some have a rust-red tinge in the contact area (3) some I can get garbled sound fx and graphical glitches out of when I try to play them and (4) some are completely unresponsive. I've tried cleaning the cartridges with dry Q-tips and, as a retro gaming site recommended, with some mild glass cleaner and Q-tips.Edit: They're working now, thankfully. Looks like you were right Shark. How to tell when a Genesis game has bit the dust
well I had the same problem with my super nintendo after trying play it after like 6 years. but after i kept trying now it always works. so it just had to warm up. this might be the problem with you