We had a similiar problem with our Avant, although without the PS3. Disconnecting the power and then restoring power solved the problem.
Beovision 7-55 with Beolab 7-4, 9s and 4000s
Beovision 10-40 with Beolab 1s and 6000s
Beosound 1, 5, 2000, and 3000
Beotime, Beotalk, Beocoms