I've purchased a Sonnet Express III-D enclosure and a Zotac GTX 1060 AMP! Edition. I have a MacBook Pro model MacBookPro11,3   After plugging in the GTX 1060 into the Sonnet and plugging in the thunderbolt cable I encountered the first issue on trying to boot the Macbook Pro. It would show a black screen with no chime and no sign of booting. If I waited for the chime and boot options (with alt key) then plugged in the thunderbolt cable the system would freeze with no chance of booting