The most likely thing is - it's failed.
You can check all the internal cables are fully seated, and try Removing it in device manager and letting it be re-detected - but after all that, they're probably the most unreliable unit inside the system.
This thread is now locked and can not be replied to.
What is Amazon Go and will it come to the UK? The store without checkouts or queues
1995-2015: How technology has changed the world in 20 years
Why ecommerce hasn't taken off on social media
New MacBook Pro 2016 review | MacBook Pro with Touch Bar review: Apple's expensive and powerful…
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.