Is it possible that the HD was just too much for your PSU?
If overloaded a PSU may simply protect itself By cutting out.
If you have a host of cards drives and other clobber, the extra HD might take just too much current as it starts.
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New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.