Replacing radio

I forgot to disconnect the
battery when replacing the radio
in my 2003 Ford Taurus SES and
it blew a fuse and won't start. I
replaced the fuse but the car
won't even start. All the lights
came back on, power licks work
again and the key phob works
but all there is is a clicking
under the dash when u turn the
key and not a dead battery
clicking. What do I need to look
at or fix??