hello friends
i have changed runlevel of centos6.2 to 5 by editing /etc/inittab file
earliar it was 3

if i want to revert it i.e setting the runlevel back to 3 ?
how do i do that, the OS is taking a longer time to boot,infact jus progress bar comes and the complete screen of virt-viewer becomes blank their is no login prompt also

i have installed centOS6.2-i386 as virtual OS on ubuntu 12.04 desktop version
i m totally new to LINUX i did all the installation after searching on google
i dont have deep knowledge of linux
so please help me

@sudi267

There is a decent tutorial on installing Centos at http://minimallinux.blogspot.co.uk/2...l-install.html

also regards run levels if you are using headless then the inittab run level should remain at 3, otherwise to run X server then run level 5 is required as at the link below

http://minimallinux.blogspot.co.uk/2...a-drivers.html

Both links cover petty comprehensively the setting up and running of a graphical Centos 6 box although with very minor modifications it can be headless/server

To set the runlevel back to 3 from 5 just
$sudo vi /etc/inittab and change to 3

To enter into a different run level you want to edit /etc/inittab. Since you are not allowed to enter into OS you will not be allowed to edit this. But there is a solution.

Enter into grub menu by pressing any key while loading. Then click a to edit the kernel. Now enter 3 [after giving a blank space] at the end of the line and click enter. Now you can enter into the run level 3 and can set your default run level back to 3 using /etc/inittab.

You are not allowed to enter run level 5 is because you have not installed desktop package.