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Post originale di: James Retling ,

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I am adding this to my knowledge base of Mac fixes and I thought I'd share it with you.

Recently, my MacBook Pro got "confused" and I could not turn the speakers on. I used a "System Management Control Reset" or "SMC Reset" to fix it.

This will work on Macs as far back as 2005.

Here is the procedure:

Shut down the computer. Make sure the power supply is plugged in (If a MacBook or MacBook Pro).

Hold down the keys "Shift+Control+Option+Power" at the same time for 10 seconds.

If done correctly, the computer does not power on at this time and stays dark.

Next, hit the power key to turn and the computer, and immediately

reset the PRAM by holding down the keys "Option+Command+P+R"

and continue to hold them done until you hear the startup chime a second time.

Then release the keys. The system should be back to normal now.

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