MacBook Pro internal and external speakers not responding

For the last 3-4 weeks, I've had odd bouts of incidents where the speakers (internal) stop responding at all.  I have a set of external speakers that are normally plugged into the computer, but they have also stopped producing sound.  Is there any way to troubleshoot this to determine the source of the problem.  (PS:  NOTHING works.  Even Skype contacts, iTunes playback, notification sounds -- everything is out.)

Bad really, coz if you could see a red light it would be much easier to solve.  The red light would indicate it was operating as a toslink (digital audio) connector and the switch that changes it from analog to digital audio was stuck.  It can be unstuck by wiggling a toothpick or cocktail stick in the socket.  It means it's much harder to diagnose what your problem is.
Suggest as a first stage that you attempt a PRAM reset followed by a SMC reset if still not working, then report back here.

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