Try opening Device Manager, selecting the USB Controllers, and from the Action menu choose Scan for hardware changes.
To access the bios its usually F2 or Del early in the startup process. You should see a message Press xxx for Setup.
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How to get WWDC 2017 tickets
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.