How do you know you blew the fuse if you can't find the fuse?
If there's not a fuse on the back of the HU (which is where it is on my Clarion, I think), it could be your car's fuse (in the fuse panel labelled 'radio').
If that's not the case, get a multimeter or test light and check the power wires. You may have a bad connection somewhere.