how can i fix my 2000 ford focus?

I put new subs in my girlfriends focus. Everything worked; the amp was on, the subs were working and the stereo was too. The subs have led lights on them and I wanted to see if some led's worked on another speaker, so I undid the wire and put it on my speaker. In the mean time the two wires, positive and negative, touched and now nothing works. I checked all the fuses and actually replaced all the size 15 fuses. Still nothing. I'm not sure what I did but I need to know if anyone knows how to fix it. Radio won't turn on, no amp and no subs