Why no sound except when using a usb adapter on a late 2011 A1297
There is no available sound for the internal speakers nor microphone jack.
The icon for sound when tapping the f11 or f12 keys has the slash for no sound unless the ubs adapter is plugged in.
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Judging by the 2 responses, I may not have made clear the problem I have
There is no internal sound of any kind nor does the mic jack for external output sound work at all.
The usb adapter is the only way there is any sound
por Dan