I just received my Dual kit for my mac mini 2012. I installed the kit per direction provided on here and after completing the transplant ( original 1TB on top and my 500 GB - 820 Evo on the lower ) I power on the unit and it booted up to the apple white screen and the circle icon with a slash in the middle. I read this topic on here before and decided to do it the way they explain it on FIXIT. Well I went back and switched the cable as per several other on here ( The original Hard drive is now using the provided cable by FIxit and the the 820 Evo is using the apple cable ) and it booted up like it should - I went ahead and checked disk utility and everything seems in order.