ok about a month ago when I installed my battery I accidently switched the electric cords that go into the fusebox. SO basically i put negative on positive, and positve on negative. When i tryed to start the car up I got no noise at all. The only thing that works is the horn and the hazards everything else does not work. I need some serious help i need to fix this by this afternoon so any help would be nice. I realize this was a dumbass mistake so please do not point out the obvious thanx

 

First, check the fuses in the main fuse box in the engine compartment. You probably fried one of them.