[CentOS] Boot failures

Hello All,

I was having some issues with samba configuration and was going to 
remove the packages and reinstall again.

I think I might have rebooted before all of the package removal tasks 
were finished running and might have corrupted something.

The system successfully boots up to the grub menu, but after that the 
boot process stalls when the centos logo comes up. I can't boot into 
single user mode either.

I'd rather not have to re-install the OS. What, if any, options are 
available at this point?

CentOS version is 6.3.

Thanks in advance for any tips.

Sam