Basically I bought a car that came with a stereo, it worked perfectly fine. I changed it to a Sony stereo that I already owned, and it worked for 30 minutes and just blew. So I changed the stereo over to the one originally in the car and it still doesn't work. All the fuses in the fuse box are okay and the fuses in the back of each radio are still goood too. Any idea what this may be?

 

Have you checked voltage on constant and accessory power? Maybe you missed a fuse.