usb failure and slow drive superdrive

Hi all,

I have a problem with my USB ports on my McBook Pro 15 "retina end 2013 - OS X 10.11.4"

On the USB ports transfer rate is as low as possible, and the Super drive (so I think) fails to load the disc. I tried to transfer power to the ports (SHIFT + CTRL + ALT + POWER), but I did not notice any change.

Before going to the applestore and leave it to the genius bar, is there a trick I can try?

Thank you

Try a reset of the pram. Command/Option/P/R/keys power button during three chimes. USB 3 has more power than a usb port 2. You can also try a reinstall of recovery. In the case where the driver didn't somehow settle.

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