Thanks SPARX, I've got an inspiron 1720 with an audio card as described
below.  Using Hardy- sound was fine until a recent update must've
altered something and everything went mute.  Turning off ESD recovered
the sound.

00:1b.0 Audio device [0403]: Intel Corporation 82801H (ICH8 Family) HD Audio 
Controller [8086:284b] (rev 02)
        Subsystem: Dell Unknown device [1028:01f2]
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR+ FastB2B-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 20
        Region 0: Memory at febfc000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: <access denied>

-- 
no sound on upgrade to Hardy Heron [Inspiron 1420]
https://bugs.launchpad.net/bugs/223638
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