Controller Gpio issue

[bizmoan]

I just seem to always find myself in these road blocks.
Got my pandora box stick gpio to my rasperry pi , everything working perfectly, I decided i wanted to hook up some wires to the gpio to turn on the arcade stick with the switch the came with the pandora box, it also turns on the pandora box led lights to the controller, well big mistake cause it uses a 12v adapter and i placed in pins 5 and 6 connected to wires from the switch and now arcade stick is phantom button pushing and i cant ge the down on player one and player two to work and the stick jus moves up on the menu on its own. I dont even know where to go from here, did i fry my pi, any help would be greatly appreciated.