Sounds as if the drive has failed. The fact that you are failing to get any indication on two machines is also an indicator.
You could try opening the caddy up and checking connections and even using a dock for the bare drive to confirm this.
This thread is now locked and can not be replied to.
UK's best mobile network 2016: best 3G, best 4G, best mobile networks revealed
1995-2015: How technology has changed the world in 20 years
Google will stop accepting new Flash ads on June 30
How to use an Android Wear smartwatch with an iPhone: The benefits and drawbacks of mixing Android…
Synology invites you to visit them at The Gadget Show on 31st March – 3rdApril. Book your tickets now and visit Synology at Stand K92