Upon startup, the internal speaker do their chime thing, but afterwards there is no sound. The place on the status bar when the volume controls are supposed to be is blank, the F10, 11, 12 keys show a mute, the sound preferences show no output (grab attached). I have searched forum and the there is no red light from headphone jack, pugging in headphones did not change. Again, this is a brand new machine that I used my SuperDuper back-up to reload. My previous laptop was 15" Macbookpro '10/2008 model. Other than this issue, all went well with the transition to the new machine. If it is a hardware issue, why do they work on start-up? thanks for your help.