Sorry folks, been without a computer for a while.
There is no sleep button on the keyboard, so that can't be it. Remeniz, I believe you have the updated version of mine which did include some function buttons. Mine is a standard keyboard, so that can't be the issue. Plus, the keyboard hadn't even moved since it last worked and when it died. It was in perfect shape.
About the number lock, I did notice that it was on, but I could never get it to actually turn off because as soon as Windows installed the default drivers, it would go to sleep!
I have to admit though, just got my Das Keyboard all set up and everything... Wow, love this thing. Well worth the money.
About to pull the trigger on a little GTX 465! Been a while since I've been into computer gaming, but a friend told me to pick up Metro 2033 and it's pretty unbearable on my current system... Speaking of, off to update my signature.