APD

Hi guys, My wife came home today complaining that the radio & sat nav on her 2008 Grande had stopped working. Immediate thought...fuses. Checked all fuses in the fuse block under the bonnet and the fuse block under the glovebox...no joy. Did both a visual and continuity check on all fuses...still no joy. So sat nav/radio/CD player/reverse camera unit simply doesn't power up. Everything else seems to work ok. Anyone got any suggestions? Cheers Paul