BIOS AutoOn Doesn't Work if Machine is Hard Powered Off

The "AutoOn" function (configured using either CCTK or manually in the BIOS) doesn't work if the machine is hard powered down (by holding down the power button). When you hold the power button down to power off the computer, the machine will not power up at the time specified by the AutoOn configuration.

However, if you shut down gracefully via Windows, the machine will indeed power up at that time. Is there a configuration option we are missing? I tried to change the "AC Power" setting to "On" rather than "Last", but that didn't change the behavior of AutoOn.

Thanks,
Stan