USB ports do not work on MacBook

This is what the Apple Store did for me.

Reset the System Management Controller (SMC):

  1. Shut down the computer.
  2. Plug in the MagSafe or USB-C power adapter to a power source and to your computer.
  3. On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
  4. Release all the keys and the power button at the same time.
  5. Press the power button to turn on the computer.
  6. On MagSafe power adapters, the LED might change states or temporarily turn off when you reset the SMC.

For more information: https://support.apple.com/en-us/HT201295

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USB ports do not work on MacBook