Under Red Hat Enterprise Linux, it is possible to change the default runlevel at boot time.
	If using LILO, access the boot: prompt by typing
	
| linux <runlevel-number> | 
In this command, replace <runlevel-number> with either the number of the runlevel to boot into (1 through 5), or the words single or emergency.
If using GRUB, follow these steps:
In the graphical GRUB boot loader screen, select the
	    Red Hat Enterprise Linux boot label and press 
Arrow down to the kernel line and press 
At the prompt, type the number of the runlevel you wish to boot
	into (1 through 5), or the
	words single or emergency
	and press 
The GRUB screen reappears with the kernel information. Press the
	    
For more information about runlevels, refer to Section 1.4.1 Runlevels.