Eric Edwards wrote:
> Shutdown works fine, powering off the machine like I would expect.
> Gnome, however, doesn't quite get there. The OS shuts down and the
> video goes off, but the power light is still on and the power supply
> fan is still turning. It is rather like a low power suspend state
> common with laptops except without the benefit of a still-running OS.

I'd upgrade udev and the kernel. I've had this myself in older kernel
versions.

> A possibly related issue:
> The screen blanker doesn't turn off the monitor, ever, despite the
> Display Power Management settings. I just get a glowing black screen.

In /etc/X11/xorg.conf, you should have a line:

Section "Monitor"
Option "DPMS"
EndSection