HT202731: Using Apple Diagnostics
Learn about Using Apple Diagnostics
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Helpful answers
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May 19, 2015 3:07 PM in response to shellydav65by OGELTHORPE,It is always helpful if one posts the EXACT MBP one has and the installed OSX.
Try a NVRAM reset:
https://support.apple.com/en-us/HT204063
More details might be useful. What have you tried to do and exactly what is not working when you connect to the USB ports?
Ciao.