accidentally switched cables in the dark-now nothing

The car was dead this a.m. early. It was still dark and I used the jumps to start it, exept that I accidentlally switched the cables. It totaled the cables and now the car won't start at all...Now what?? Any help please! thanks

I'm not sure if this will help but, I had a friend who did that on a toyota (I know completely different but) the car sat for months and then was given to me for free. There was an inline fuse on the positive cable that was blown. The cable had to be replaced. I got one from the junk yard. Car ran perfect after that and a new battery.