laptop doesn't power off

[Tim Matthews]

I have a sony vaio sz483n. The powering down works almost fine up until the
last step. The screen goes clear as it is about to power down but then it
just stays in a kind of on state.

The power light stays on but it doesn't do anything else. Even holding down
the power button for a long time which would work at any other time does
nothing.  Rebooting works fine.  Other operating systems on this machine can
poweroff fine. Using either gnome's shutdown, shutdown or halt makes no
difference.

I have attached my asl

Thanks
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