It would seem that the permanent live has disappeared, for the stereo, which also does a few other things that are live all the time like clock etc.
It is either the RED or the YELLOW wire to the connector, one is ignition swithced, one is permanent live, can't remember which is which, so you will have to have a prod and see, check the fuses, and wiring as far as you can, I seem to remember the permanent live comes also from the ignitions witch area input side, but could be mistaken.
tabetha