Aereo

Hi, I got a broken R9 380 that stoped working for no apparent reason, I was talking to a friend, told him I'm using a GTX 660 and he gave me this one and said that if i fix it, it's mine. My build is old and as it follows: AsRock 930 Pro3 AMD FX-8350 BE 4GB DDR3 RAM Corsair CX 550W the gpu was not used for a long time, i opened it, changed the thermal paste gave it a cleaning (was already pretty clean) reconected everything and gave it a try, nothing even lights up. No coolers spin in the entire pc, my mobo doesn't have a onboard video, so it doesn't start without a gpu, which means the mobo doesn't ever detect a gpu. I know it isn't a mobo problem because it works well with my old GTX660. What could cause this kind of problem?