Radio / Audio No response

[simoncpw]

Hi all,

I have the factory Head unit with LCD monitor and premium DSP audio.

While listening to radio this afternoon, it suddenly lost the audio.
- pressing the "Mode" button has no response, doesn't switch to tape / CD / Radio
- pressing the Audio On/Off button (the round knob on the right) has no response, doesn't switch On/Off
- the "DSP" on the main menu sometimes go dim, some times normal
- switching off the car for a while doesn't help.

Everything else on the head unit / computer works fine; just the radio / audio part if not responding

Any suggestion of what might have caused this?

Thanks in advance.

Simon