Balaji wrote:

After some changes the Linux Boot-Up Progress bar "Show Details" Menu when i enable the Menu it will not shows the start-up services details.

When the grub menu appears, press a key to interrupt the countdown timer. Then press "e" to edit the default boot kernel settings. Follow instructions on the screen as they appear, but the aim is to edit the boot command and remove the "rhgb" setting on the boot command. This will disable the "GUI" boot and you'll see a text based boot sequence. At one point, you'll see where the damage is.

Using this same technique, you can edit the boot command and add "single" to the command so the machine will boot into single user mode. You can then correct your error and hopefully the machine will then boot normally. If your server is badly damaged, you may need to boot into rescue mode using the CentOS install CD/DVD.

Let us know how you get on :)

Ian