Got a new iMac up and running with no sounds at all. - downloaded all updates and the sound worked for a day! then stopped, checked everything and I mean everything - even tried tech support - what a joke - they don't work at weekends - still nothing - Apple this is a pile of crap!
This iMac is 2 days old, I cannot access the built in speaker in Audio MIDI Setup, greyed out, no sound in headphones, but plugging and pulling out seems to activates the sound. Looks like a faulty headphone jack. Thanks