Radio/stereo stoppoed working
 

I have the high performance radio/stereo unit which also displays reversing sensors, temperature control etc. and links to phone console. Except that suddenly it stopped and now has no display or sound. If you press the on/off switch the opening screen comes on briefly but goes off and there is no sound or contact with any switch, the phone or the reversing sensors.
Anybody have any idea what has happened.?
And if the unit is 'naff' can I replace it, if so, what with?
Any help welcomed.