Hello everyone:) Just wondering if there is anyone out there who has had an issue with their stereo unit seizing up after a flat battery. We have a message which is frozen on the screen which says... No dvd, please insert map dvd. We have done this and the dvd is not re`setting the stereo unit. We can`t operate our radio/cd player, reverse camera is not functioning either. We have been told by one of the Toyota dealers that we may need to fork out 4-5k to completely replace the head unit:( Not keen on paying that expense just because we had a flat battery and our head unit has seized up. Any help would be much appreciated. TIA.