My nine month old 1.9 CDTi Signum has failed to start on three occasions. Electrics seem to be fine but turn the key and nothing happens - no starter or engine at all. On turning off the engine before the problem there has been a warning buzzer which stops when the key is put back in.
On one of these occasions the spanner symbol came on and the car lost power when driving at about 35 - wouldn't rev at all. When coming to a stop and turning off it then would not start again.