Here's a great Article on How to Change Run Levels in Grub2.... 

Don

GRUB2 runlevel 3 – Howto Change runlevel on GRUB2

Updated by JR on Jan 25, 2012 in CentOS, Fedora, Linux, Red Hat (RHEL) | 2 comments

This is quick guide howto change runlevel on GRUB2.

(Skipping on down. Read the rest on his page at the link below...)

1. GRUB2 Default Screen

Press arrow key when you see GRUB. Select (highlight) kernel to edit and press 'e'.

2. Add unlevel parameter on Linux line

Goto 'linux' line with arrow keys, then press 'end' button to get end of line (or move cursor to end of line with arrow keys). Write space and your runlevel number end of line. Here I use runlevel 3.

3. Boot to selected runlevel

Press Ctrl+x or F10 to boot (esc to cancel).

Go there...
http://www.if-not-true-then-false.com/2012/howto-change-runlevel-on-grub2/

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Fedora Linux Grub1 and Grub2 Changing Runlevels at Boot Time

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E.8. Changing Runlevels at Boot Time

How to Change Runlevels — Fedora Unity Project

GRUB2 runlevel 3 – Howto Change runlevel on GRUB2

Fedora Linux Grub2 Changing Runlevels at Boot Time - Google Search