Try booting the Install media and entering 'linux rescue'. Strictly speaking, that works on the std Centos/RHEL media; not sure if it will work for you.
If it does, you need to mount the HDD and edit /etc/inittab and set the initdefault line
Code:
id:5:initdefault:
#Change the 5 to 3
when you reboot, it should just bring up the console without X-win. Login as root and try
& see Chap 30
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