[plug] power down- won't turn the pc off

[Craig Ringer]

>>I have three linux pc's here at work and two of them won't turn off
>>when  'shutdown'.  They are happy to reboot no problem, but just sit
>>waiting for a hard power off when I shutdown -h now.  I know this is a
>>common problem, anyone got a fix?
> 
> 
> You don't have APM (power management) compiled into the kernel.

Or its an AT PSU/MB that doesn't support soft-off.