Why isn't my sound working at all?
I have Mac OS X 10.7.5 (Year-old Desktop). The sound tells me that it's all the way up, but it shows a ø sign under the sound volume. it will not let me adjust the sound, and it does not play sound. When l restart the computer, instead of the normal Mac startup sound, l get this loud tapping noise for a few seconds.
Safebooting doesn't help, restarting doesn't help. Plugging cables in/out of the sound output and input jacks doesn't help. Could the audio board have gone bad Sound On My Computer Doesn't Work? What can l do about it?
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