Omg my nikon 3100 is not working HELP!!!!!wat is wrong with it?

hey so yeah i kinda dropped the camera n then the lens part of the camera was kinda misplaced so i removed and im trying to fix it again back to camera!! but its not working!!! i fixed it back in but its kinda LOOSE...i dont know what to do ..i dont have the warranty my mom would kill me...why is it not working?? it says error the shutter is loose?? what should i do??? PLS HELP ME