Why did my head unit stop working in my 95 Ford F150?

I was putting in a new head unit everything was working. I was putting it into my dash and the wire caps came off two wires that I believe weren't even connected to the head unit, and touched together, it sparked and the radio stopped working completely. I checked the fuse on the radio and the fuse in the fuse panel, both were good. I took the head unit back and got another one, thinking maybe I fried it, new one didn't work either. I replaced the wire harnesses and rewired them and still doesn't work. What else can I do? It doesn't make sense. Any suggestions would help, thanks.

Does the radio light up at all?

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