Sorry about the confusion, I ordered a zotac 1070 mini and I’ll give you an update on whether it worksYes it could have been. You replaced it with another card and the replacement worked.
You didn't mention that earlier that it was a cheap purchase (basically used card) from eBay. It might have been faulty and that's why the previous owner decided to sell it cheaper.
You said you "bought a new Gigabyte GTX 1060 6GB". Maybe you meant "new" as in it's a new card in your system but it also sounds to us like it was a brand new card.