help to disable ctrl-alt-Backspace

  I want to disable the ctrl-alt-Backspace in gnome.
I uncommented DontZap in /etc/X11/XF86Config.
I did that in two PCs.In one PC,ctrl-alt-BS disabled.
But in another PC,it is not disabled.
Is there any hardware dependency?
Please give me the solution as soon as possible.
     Thank you.

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