If you are experiencing problems with GRUB, you may need to disable the graphical boot screen. To do this, become the root user and edit the /boot/grub/grub.conf file.

Within the grub.conf file, comment out the line which begins with splashimage by inserting the # character at the beginning of the line.

Press Enter to exit the editing mode.

Once the boot loader screen has returned, type b to boot the system.

Once you reboot, the grub.conf file is reread and any changes you have made take effect.

You may re-enable the graphical boot screen by uncommenting (or adding) the above line back into the grub.conf file.