Power off problems - ASUS P6T6 - WONT STAY OFF!

I have an Asus P6T6 WS board in a Coolermaster Cosmos case. When I shut down using startshutdown Windows goes through its shutdown routine and then powers off (case lights go off/drives spin down) then about 10 seconds later it powers back up on its own. To stop it from doing this I have to reach behind the case and flip the rocker switch on the PSU to OFF and leave it there for a few seconds, after that I can flip the rocker switch to ON and the computer stays off. I have looked in the bios for any kind of power on settings and cannot find anything, can anyone help out here? Is anyone having a similar problem?
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  1. Which version of windows?

    You are selecting shutdown and not restart? OK, had to ask. :)

    Go into your BIOS and double check your ACPI settings. http://en.wikipedia.org/wiki/ACPI

    More likely is that either your windows power management settings ([control panel]->[power options] Advanced tab}are in conflict or you are encountering a problem during shutdown that triggers windows to automatically restart.

    Look here http://support.microsoft.com/kb/320299/
    http://support.microsoft.com/kb/311806/

    If all that fails, take a closer look at your PSU.
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