USB disabled after the update of the Sierra (a short circuit and a work)

Hi, when I bought my mbp 13 inches mid2012 (used, not new) I noticed that a USB port did not work. In the Yosemite sometimes I noticed that a USB port consumed too much energy and have been disabled. (I think because the usb port has been short-circuited. Year when it was time to update the mbp to El Capitan I had a few panic the kernel and the newspaper was shown as the last driver loaded the USB driver, so I kept the mbp with Yosemite. A few days ago, I updated for Sierra but only usb which used to work stopped working. It has enabled and turned on but Finder and disk utility does not see the drive. In an Apple dealer they said that could be established relationships with some oxide and next week will take it and see what the problem is.

If there is someone with the same problems, please tell me what to do! I don't want to put in the trash my mac just for a flash drive... but I need!

Hi Supermene,

Thank you for using communities of Apple Support. Based on what you said, it appears as a USB device is not recognized in one of the USB ports. There are a few things that can cause this. I recommend you read these articles, which may be able to help solve the problem.

macOS Sierra: If a USB device does not work

Reset the management system (SCM) controller on your Mac.

See you soon.

Tags: Notebooks

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