I should have mentioned that my mobo is a Gigabyte DS3 motherboard and ACPI is 
surely supported.
http://tw.giga-byte.com/Products/Motherboard/Products_Overview.aspx?ProductID=2314

But I will try the boot option and see if it helps.

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Pressing power button hangs the system with 2.6.15-20-686
https://bugs.launchpad.net/bugs/40243
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