Hello, it looks like I've gotten into a big mess and I'm searching for assistance. I was interested in dual booting Kali Linux on my macbook air and I followed this guide: http://docs.kali.org/installation/kali-linux-dual-boot-on-mac-hardware I seemingly followed all the steps, but I think I didn't install rEFInd correctly. In the installation process I had installed GRUB bootloader and since I have been unable to boot into OSX. I see the osx partition on Linux, but while powering up the computer and using the option key to choose an OS to boot into while clicking the macintosh hdd icon I get sent to a blank gray page with a cross and a circle around it. I've tried internet recovery, but it doesnt find any disks to install the new OS on. What should I do?