To reset the root passphrase via GRUB

1) Rescue CD and do whatever

or

2) When in GRUB hit
A

Add to the parameter 

; single

And away you go.

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So I so rarely have to muck with grub but when I do I always end up spending
hours fucking with it.

Anyway here's what I had:

Motherboard with built in SCSI controller
Add on ATA/controller

/sda1
/hde1

Linux was installed on /sda1 however linux itself was installed on /sda1

Installed a new hard drive.  GRUB promptly hangs on install.


Fix?

Boot up Fedora into linux rescue mode.

% grub-install --recheck /dev/hde1

Check to see where all your devices are /boot/grub/devices.map

(hd0) /dev/hde
(hd1) /dev/hdg
(hd2) /dev/sda

Reinstall the MBR

% grub-install '(hd0)'

But all the entries were now off by one in grub.conf.  Fix all the:

root (hd1,0)

to

root (hd2,0)

Reboot and was good to go.

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Grub -> defaultly boots to /boot

C will give you limited visbility and shell.  
grub> kernel /v [TAB] 

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To 
Remount file system as rw: 

% mount -o remount,rw /