If you boot using recovery mode, then 'shutdown -h' do you see anything suspicious at all?
** Changed in: linux-source-2.6.20 (Ubuntu)
Importance: Undecided => Low
Assignee: (unassigned) => Ubuntu Kernel ACPI Team
Status: Unconfirmed => Confirmed
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Computer doesn't power off after shutdown (Feisty)
https://launchpad.net/bugs/96236
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