SNES games don't work.. any reasons why?

Hello! I've got a few 'new' SNES games from a friend to hit time dead for a while. Sadly, one of the games didn't work. It showed a black Screen instead. I had the same problem with Hebeke's Popoitto, but this game destroyed my Reset-Button for Whatever reason..

I keep the port (or the console in general) very clean, and the same goes with the games. The games work fine on my friend's SNES. I even check if i have the right games (PAL ver.) and even that is not the issue.. the games aren't bootlegs or 'hacked'. All plugs are plugged in correctly, they're not loose. And some other games work perfectly fine. Is there any reason why certain games don't work?

I was planning on getting a few more games, but i'm scared that they may won't work too.

Important Information: http://nintendo.wikia.com/wiki/File:Supe... That's the console/prototype I actually mean, just in case this helps.