Newly built PC wont stay off

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I am about to toss in the towel and buy a Dell
After assemblning my PC using the Gigabyte ga-k8nxp-sli board I find that after I shut down Windows, the darn thing boots up on it's own ]
If I throw the switch on the back of the PSU and leave it for a few hours, then throw the switch back to the " On " position the PC will remain off until I hit the power button
Once Windows loads and I run the OS for a bit, then shut down, ether by power button or start menu, The thing will come back on after about two minutes
I did not reload the OS after the motherboard swap
The old board was an Asus A8N-SLI premuim with the flaky lan controllers, I did not reload since both boards have the nforce 4 chipset, Once I back up the data I plan on reloading Windows
Maybe this will clear things up
I checked the other post regarding a haunted PC and checked my bios settings etc
I hope I don't have to return yet another bad board, geaash, Maybe that Dell XPS IS looking good about now and a good copy of SUSE 10.0

[confus-ed]

Remember atx boards are never 'really off' until you either unplug 'em or flick the switch at the back - faulty case switch(es) ? iffy psu ? I dunno what you've got handy to help with diagnosis..

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I would have to tear apart my Linux box for a test PSU, but this problem nenver occurred with the Asus board in this same system

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I found the problem, It was a simple setting under Windows for my network adapters
I phoned my local computer store where I get my parts and the service guy told me to unplug the network cable and then shut down
I did what he said and the system stayed shut down, So he directed me where to go
Device manager/network adapters/properties/advanced tab
Under the advanced tab I had to disable WOL and the magic packett , I did this for both lan controllers

It seems that these new onbaord lan cards have this latest feature, Great for remote admin, but poor security ,
I hope my little problem and solution will help others with systems that keep going and going and going and going

[confus-ed]

..found the problem..Device manager/network adapters/properties/advanced tab
Under the advanced tab I had to disable WOL and the magic packett , ..seems that these new onbaord lan cards have this latest feature, Great for remote admin, but poor security ..

Thanks for pointing this out - you are quite right this is an important thing to be aware of - however I'd say whoever is designing these bioses is an idiot ..

All Atx boards are capable of entering 'atx low power state' when you press off, that's what they are supposed to do (they can't do any other because its not a 'real switch', it's connected to the motherboard & not the psu, so it must work like this), WOL should only wake a machine from standby & not from this state, the only thing that should wake the machine is a physical local event, such as pressing a key, or the button on the front - its a part of the atx specification for low power consumption, & its there, so that you can put the 'box' wherever the hell you like or inside something else to aid physical security, as it means you don't have to have access to the physical power control.

I shall have to add yet another thing now to my compliance testing

Once again though, thanks for making this nice & clear for me to have a rant about !

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Yet another security hole for hackers to exploit, I agree that only a local event should wake up the machine
The service guy told me that the store was getting a lot of PCs with this problem
I don't understand why Gigabyte, Asus are installing office networking features on a consumer level motherboard that may only be used primarly for the gaming enthusiest
I would prefer a seperate NIC card after this sleigh ride