Do you have any other Thunderbolt equipped hardware you can try to rule out the Thunderbolt port(s) on your system? It s rather rare but is a possibility.
If the Thunderbolt interface has gone bad on the drive you can always get a replacement under warranty. The RMA process is done on our website here: RMA
Unfortunately I bought it as a new item, from a seller on ebay, its not showing up on your RMA system.
I have just tried contacting them through ebay, but ebay’s system spotted me putting my email contact address and blocked communication. I doubt that I will be able to secure any refund from the seller as it stands.
I am just wondering if its possible to salvage the drives from it, to keep the storage functional, in a different raid sytem. What would be your recommended approach for that? Would WD be prepared to supply a new casing?