F16 failure to completely boot - hangs at 'Started Display Manager'

[Joe Zeff]

On 03/11/2012 11:19 AM, Gregory P. Ennis wrote:
> Starting Display Manager.....
> Started Display Manger

I had that problem on this box after an "upgrade" to F16 went sour.  Try 
booting into runlevel 3, or whatever it's called now, log into a CLI as 
root and try this:

yum reinstall gdm

and reboot.  In my case, a database had gone away and the reinstall 
restored it.