CentOS - Jul 2011 - centos 6 and mingetty for /dev/ttyS1

I've been playing with centos 6.
Sometimes it gets into a mode when it "seems" like it hangs at boot.
At reboot I hit ALT-D for details and the last thing printed is Starting 
atd.

No I can press alt-f2 to get a login. Doing ps ax does not show a 
mingetty tty1,

What might be going on here. What isn't completing to get a full boot.

Thanks,

Jerry