Just bought this camera and done a sound check - got nothing back.  Tried an external mic - nothing back.  Gone to mic settings and switched between manual and auto (after cranking vol to max).  Still nothing back.  Gone to mic settings again to look at function options - can see them but it just says unavailable when I click on them.  Is my camera defective or have I missed a trick?  Either way, Amazon won't replace it as I got it as a 'warehouse deal'.  Just thought I'd ask here before asking for a refund.