pixhawk will not arm

I have a pixhawk that i was hovering one day when it just took off and hit a tree and fell about 10 foot to the street upside down, broke the GPS mask off and now the pixhawk want arm and the GPS seems to be off a little.

The pixhawk worked great before this happened, i think it took off because i did not have the latest firm ware on it.

I am not good at setting this thing up so i have no idea how to check it to see what is wrong.

Also the pixhawk was inside the quad so it did not come in contact with the street.

anyone out there know how to check and repair this flight controller?