Help with my SNES console?

What you can do is get a Q-tip and slightly wet both ends, then rub the little metal strip on both sides with the wet q-tip. make sure to rub both sides again with a dry q-tip when finished. If the q-tips have brown to blackish stuff on them, then your games were the problem. Sometimes went old cartridge games are sitting for a while and not used, you can just do that and then they work fine. The yellow case damage is very common with SNES. mine is really yellow and it plays fine. Blowing/wiggling doesn't always work when they have been sitting around for a while.