Partner de Peugeot sans démarrer

Hello dear someone could help me with the next problem
today they have brought me a Peugeot Partner 1.6 diesel because it does not turn on, the entire instrument picture works but there are no flashing audio or heating, nothing did only one day I keep one day working all OK and in the morning he did not want to turn on, already check the Bsi and even put it in another board and are all good, if someone could orient me what to do the most I would appreciate them very much