I have just upgraded my stereo to a sat nav unit with video input, all working fine and then just went off. All fuses are ok - checked a second unit which i have still no joy. Checked the audio system fuse (30) and is fine, but definately no power to the audio iso lead. Can some one shed some light as to what could be the problem. nothing else has stopped working, could it be a specific relay? or am i checking the wrong fuse? Please help. G. :D