Internal Speakers Patching In and Out

My speakers do not work for the most part, but occasionally they patch in, work fine for a few minutes and then patch out again. At first I thought this was a loose connection, but perhaps it is a software problem. Any ideas?

Try this:
Open /Applications/Utilities/Audio MIDI Setup
Select the Output device
Set the format to 44.1Hz at 16-bit
Then close

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