No Sound from Stereo..?!?!

[w00dhead]

All of sudden i've no sound... Standard Toyota 58806 stereo. All working as normal on the face of it: cd player is working, radio appears to be working, ariel motor works as normal (althought the thing has never gone up or down since I've had the car) just no sound coming from the speakers.

The odd thing is however...when I go thru the motions of pre-setting a radio station I get the confirmation high pitch 'beep' which is played out from the speakers...?!?!?!

Anybody any ideas?