Am I the only one who read this part:
except I did not attach the mother board to the case cause the screws did not fit right
Heres the thing. Sitting the mobo on the standoffs or not rearranging them to properly fit the holes on the board means you could have a standoff touching a area on the back of the mobo causing a short.
Pull the mobo out and see if you can change the standoffs around to match the mobos layout. If not, you need a new case.