I had my mbp working perfectly, dual booting os x and kali. Everything was great, until i wanted to downgrade os x. So I decided to just run kali on my mbp.

I installed to the entire disk, completed the install, and restarted. I am not able to boot it up normal. I am only able to get it started with a grub fix disk that I had from before. I am able to insert the disk, hold down 'c'. It finds the grub file, it detects the os. I can (and currently do) select the disk or grub file and boot from that in order to get into kali and type this post.

I also have a boot repair disk that i use. It claims that it "fixes" the issue and to restart, but yields the same result.

The grub fix disk is able detect grub file and kali.

How can i get this to boot up correctly without needing the grub fix?

thanks