I have been experiencing this problem from months now, but did not bother to ask for help. I noticed that the WIFI blue led on my SAMSUNG notebook NP900X3G is always on before logging in to Windows, that is when typing the access password. Any attempt to shut it down through hard (Fn+F12 key) fails. This happens even if the laptop's network connections (WIFI adapter) have been disabled in Windows. It wasn't always like this; after purchasing this notebook, I was still able to disable. Is this normal behaviour?