radio problem

[x240xdrifter]

so the other night, not paying attention I put my terminals on backwards and try starting the car, and then relaized how stupid I was and turned the battery round, so long story short, nothing electrical works in my car except my starter which clicks and the turn signal lights in the front, the rear lights don't work, the radio doesn't, the digtal clock lights up but doesn't tell time and so forth, so turns out I blew my alt fuse, I fixed that and put a new battery in and now everything works but one thing, my radio. so I checked the audio fuse, its fine, all my connections are good and I looked in the back of the radio which is a pioneer DEH-P3700MP to see if there was a fuse behind it and if it was blown, well there is no fuse behind the radio, and I'm running out of ideas, does anyone have a clue on how to fix my radio?