Click “Start”, on “Computer” click right mouse button and select “Properties”, click “Device Manager”, select “IEEE 1394 Bus Host Controllers” group, only contains one device called “VIA 1394 OHCI Compilant Host COntroller” on that click right mouse button and select “Properties”, select “Power Management” tab, and finally check the “Allow the computer to tur off this device to save power” box!
That’s all folks. After that the computer power down normally every time.