Guys thnks for the responses, but it was corrosion after all. I took a very small screwdriver and scraped a tiny layer of metal of each pin until they were shiny again. Then i made sure with some white-spirit that no metal flakes remained and tada it works
I'm having the same problems with the board. Did anyone try something else besides reseating the roms and messing with the power supply. I tried both already and no luck.