Today while driving my stereo stopped working. I went home and popped off the head unit to connect a few loose wires. I then tried starting my car and it wouldn't turn on. So I noticed that the fuse had been blown and I went to buy a replacement one. The lights. Headlights, dashlights, etc. All worked out fine. However, my car still won't start. I don't even hear the "click" or the engine turn over when the key is in the ignition. Any ideas on what I should do?