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I see that there is a way to force a system crash from keyboard. http://msdn.microsoft.com/en-us/library/windows/hardware/ff545499(v=vs.85).aspx

But does this work when the system is hard hung? i.e, when the keyboard is not responding?

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Just because you hit keys and nothing happens doesn't mean the keyboard is not functional. There is a major difference in how the signal from a USB keyboard and a PS2 keyboard travel. In that respect, it makes a difference on exactly what caused the hang. In most cases, you'll always have a better chance of a PS2 keyboard getting a signal through. –  MaQleod Dec 11 '12 at 1:24
    
Oh Ok. I was using a USB keyboard. And it did not help when I tried to force the crash during hang. May be I should try a PS2 keyboard if that helps here. –  user682765 Dec 11 '12 at 1:34

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