Well, I got through the partitioning and the installing and followed a tutorial to enable Grub to load first, but after that, I have no clue what command to tell Mint to proceed loading.

Can anyone help with this?

The installation was pretty easy..looking forward to using Mint!

Thank you!

Please post grub.cfg.

Hard to understand what you mean.

GRUB is a bootloader and if Mint has installed GRUB on the machine, it must obviously either boot Mint directly or give you a menu where you choose Mint.

If GRUB starts up correctly, then what do you see? What prevents you from booting Mint?

I've retired my last Apple equipment but what I used to do was install rEFInd. That was the easy way to choose between GNU/Linux and OS X upon booting. You have to periodically reinstall it though, something OS X does in its updates occasionally scotches the configuration and causes the machine to boot straight to OS X. When that happens, nothing is lost, you just have to redo rEFInd.

When I reboot the Mac, I see a dark screen with light gray type. There's a short paragraph instructing that terminal commands will be revealed by pressing the TAB key.

beneath that it says something containing grub, with a flashing cursor where you enter said commands. Nothing I've typed results in Mint loading. There is no choice "Mint" that I can select.

When I type boot, it responds that the kernel must be loaded. That's about all I know. I've used terminal commands in the past, but I'm not the guy who knows the command for every situation.

Thank you

It sounds like it's not finding the correct root directory. In the grub menu, before it starts booting, hit "e" and change the kernel line from UUID=something to /dev/sda2, or whichever device is your root file system.

Ok, broken GRUB. And to be frank with you I don't know how to boot the Apple OS with GRUB. So I will direct you to rEFInd.

rEFInd is a boot manager, i.e. it is used to chainload bootloaders like GRUB in EFI boot mode. But you can also tweak it to boot kernels.

Take some time and check out these:
http://www.rodsbooks.com/refind/index.html
https://docs.slackware.com/howtos:sl...talling_refind