Ok so I did a fresh install using the clover technique of installing Sierra. Everything works perfectly, I used a USB audio for sound, wifi is great, the graphics run smoothly. I just cant get it to boot from the HDD, it only boots with the USB plugged in. I'm certain its something to do with the EFI partition or something. I've tried everything I can think of but nothing is working. I have an Asus motherboard and I read that this could have something to do with it? Please can someone help!!!!