Are you sure all of the fuses are good? I've had this happen a few times before.
This will sound wierd but is there power to the cigarette lighter below the radio?
For some reason, they are on the same fuse. I don't remember exactly which fuse it is. But it's in the fuse panel located behind the pasenger kick panel. On the row of fuses closest to the firewall. It's pretty hard to see without being on your head in the floorboard. I'd check this location very carefuly
Somewhere between F06 and F10