Vista Home Premuim turns on by itself after shut down

[Bert]

I just purchased a new Dell Insperon 530 Vista Home Premuim.
I turn of the computer 20 + min later system turns on bitself.
I have checked all the power management settings.
Uninstalled the new programs i installed .
Deleted the original profiles.
Same issue.
Key board is usb
Mouse is usb with no tracking wheel
Is this some weird issue with Vista or hardware issue.

 

[Mark L. Ferguson]

Your BIOS setup may have an entry in the S3 options for 'Wake on Lan'
bios setup access keys. Go to:
http://michaelstevenstech.com/bios_manufacturer.htm
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Mark L. Ferguson

..

 

[Martin]

Check what you mean by "turn of". Shut Down is different in Vista. The big
power button on the Start menu is "low-power", not Shut Down.