Another video game related problem...
 

Does anyone know how to fix the first controller port on sega genesis? the problem is that the up button doesn't work at all on that side.

Sounds more like a controller issue than a port issue...but I'm far from an expert.

I tried the controller on both ports...

I had this problem too. I used book to push up at the controller port (book is under the point where plug and port meet and not under the console). The plug would seems like it's gone skew in the port.

Most likely a broken solder joint, which can occur after forcefully removing the controller. You'd have to open up the Genesis and test each solder joint with a multimeter for continuity. Unless you're savvy with electronics and re-soldering, you may need a new system.

^^ This. Good thing you could literally get another one for like 25 bucks. That's what I did when my Genesis fried.

Were you able to fix the problem?

Unfortunately not... I opened up my system and I found that everything is in order... but I discover that the pins on P1 seem to be stained... I tried to clean them with rubbing alcohol... and nothing.... Does anyone know how to clean them?