CrunchBang Linux

I haven't the foggiest idear how I got it to boot in EFI-mode. I am not sure that is even what I did, honestly. Information about how a computer boots seems to be hardware-specific & is (relatively) obscure. Furthermore, a setup like this is not aboundingly common & I hear conflicting stories all the time.

UPDATE: It is worse now.

For the past week or so, I've been booting into Crunchbang by entering the commands in the GRUB rescue shell I gave above. I figured that was OK until I figured out exactly what was wrong.

However, tonight I log in and there is not even a GRUB rescue shell, just the word GRUB followed by a blinking underscore. (I solemnly swear I didn't touch nothing!)

I read the post from AdamW's blog #! Cat linked to above. But I couldn't really see how the context & clarity AdamW provides helps w/ my problem.

I am going to try a NVRAM reset & see if anything changes.

::sad clown::

Thanks you two!

I have just now tried using gdisk's t option to "change a partition's type code".

I changed it to a BIOS boot partition using the type code "EF02" #! Cat pointed me to.

I then rebooted. Sadly, I was again given the grub rescue prompt and entered the commands from the UbuntuForum above in the shell.

Further Verbose Explanation of Situation:

I am a little worried about following the instructions given by the links in Head_on_a_stick's edits, because I really do not think I was ever using EFI booting to get into Crunchbang itself. EFI would boot the MacBook, but then from rEFIt I would then boot Crunchbang with GRUB. (If these things belong to different categories, please excuse me.)

The computer would boot using EFI, in some sense through Mac OS X or something Apple has in the EFI Boot Partition in /dev/sda1. It looks like this:

$ sudo mkdir /boot/efi 
mkdir: created directory `/boot/efi'
$ mount /dev/sda1 /boot/efi
$ cd /boot/efi/EFI/APPLE/EXTENSIONS/ 
$ ls 
Firmware.scap 
$ file Firmware.scap 
Firmware.scap: data 
$ stat Firmware.scap 
  File: `Firmware.scap'
  Size: 15729264  	Blocks: 30722      IO Block: 512    regular file
Device: 801h/2049d	Inode: 23          Links: 1
Access: (0755/-rwxr-xr-x)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2014-10-18 15:41:03.000000000 -0400
Modify: 2014-10-18 15:06:18.000000000 -0400
Change: 2014-01-03 15:24:22.830000000 -0500
 Birth: -

I do not think I ever had anything else in /dev/sda1 successfully. 

I would see the rEFIt menu. I would choose Linux from the menu. Finally, the Grub menu would load. I would then select "boot Crunchbang 64 bit" (or something very similar). 

I have never been able to use this GRUB menu to, say, boot Mac OS X or Windows. Even though it would give them as options, GRUB could not actually be used to boot these OSes, only Crunchbang.

I'm pretty sure I have clear memories of installing GRUB to the same partition I installed Linux on, and am fairly certain I never installed an EFI GRUB.

I was never clear why I did it this way, because I made the decision intuitively and after trying to install to "/dev/sda" failed repeatedly.

I am sorry I do not have more precise language for this. Please let me know if there's any information I can get that may make the situation clearer.

(Also, is there any longer form writing on these topics that explain each layer at play here thoroughly?)