Could you try this below :
While booting, press either down arrow / any key to display the grub options which looks like
kernel /boot.vmlinuz-2.6.9-22.EL ro root=LABEL=/1 rhgb quiet
Do add value '1' to second line like :
=> kernel /boot.vmlinuz-2.6.9-22.EL ro root=LABEL=/1 rhgb quiet 1 by pressing alphabet 'e' by getting into second line. Then, press enter and press 'b' for booting. It will take you to bash shell -> sh-3.00#
type init 5 and enter which takes you to graphical mode into login window.
=> sh-3.00# init 5
It will take few seconds to start xwindow.
INIT VERSION 2.85 BOOTING
INIT : NO INITTAS FILE FOUND
ENTER RUN LEVEL : 5
It should take you to login window.
If that does not work, try entering '3' which is purely a command line mode. From where you could enter init 5 to enter into graphical mode to view login window.
Hope this works. Get back if problem still exists.