Not rebooting

[John G Heim]

What would cause my machines to not reboot at the end of an FAI install? 
I have the reboot flag in the kernel parms., 
"FAI_FLAGS=verbose,sshd,createvt,reboot".

I logged into a machine during an install and checked the value of 
flag_reboot and it's set to 1.

# echo $flag_reboot
1