USB output and Audio fail

Several days apart my audio output has failed and then doesn't have a single USB port. It's a question of remedy, or am I headed for a new logic board? I have an IMac 21 "end ' 09 running 10.11.5

A bad USB device or a USB cable can simply triggered the USB port overload protection.

First try to reset the SMC, according to > reset the management system (SCM) controller on your Mac.

If this does not help, try again but this time unplug everything and wait a few minutes in step #3. Then test each USB port one at a time with a good working USB device.

Tags: Mac

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