Sounds like you installed the wrong lcd. Make sure you bought the correct lcd for your ipad mini model. Ipad mini 1.0 LCD is NOT the same as ipad mini 2.0 LCD, however, it is rumored that you can use and ipad mini 2.0 lcd with and ipad mini 3.0
Pete H: simpler solution to the screw problem: get a fridge magnet rectangular, place the screws in the same orientation as the phone. problem solved :)