Burnt relay fuse labeled "head" and after I replaced my head unit/stereo is still not working.

I couldn't see any other fuse relays or anything else for that matter wrong electronically. So in wondering may the wires that connect the stereo to the battery and relays or what not be burnt out also. As far as I know it is just the stereo that is not functioning. I did take it out to see if it was damaged but nothing seemed out of place