I can get all sounds except system beep. I hear any sound except:

a) network signal lost. I have the preferences set to yes to beep when network service is unavailable.

b) soundrec 'beeps' when start/stop a recording.

I believe I can hear any other sound. I have tried turning on System Sounds (which I normally have off) and I can hear dialog & hard key presses but not the beeps I have mentioned.

I tried everything but a hard reset. any other ideas?