Stereo Isn't working

[Dsands503]

I just bought a new Pioneer deck to replace my old one. Once I put in the new one, and attached the wiring together it was working fine besides sound coming out. I unplugged the wires, and put it back together and now nothing is working on the stereo. I even tried connecting my old one, but that too stopped working.
I also checked the fuse box, and the fuse looked fine. Any ideas on what it could be?

 

[DjDom]

Usually when the sound isn't working, it's because you didn't properly bypass or incorporate the factory amp.

However, in your case, you had to blow a fuse or the ground is not properly functioning.