I have a 2003 Chevy Trailblazer and my friend jumped it hooked it up on the wrong thing and blew something. Now my radio doesn't come on windows don't go up or down seats don't move no lights come on

check your fuse box. it sounds like he blew a fuse.

Have you checked any of the fuses, if they are ok, you may want to check if the relays are bad, they should be in the same fuze panel....

I check and replaced the fuses in the fuse box

i think you have more than one fuse box did you check

As stated above, check your fuses. Most likely in the secondary fuse box which is located under the back driver side seat. I just jumped mine recently, with no error and the radio didn't come on. In my case, I pulled the fuse, and as it was still intact, cleaned and put back in place. Radio works now! While in the fuse box I noticed the things mentioned are in the same fuse box.