Ah, tweaking...it's a double-edged sword. You'll learn to use it judiciously. It sounds to me like you turned off something in the default runlevel (I think it's 5 for RH-based distros) that the X server or Gnome needs. What I would do is go back into ntsysv and re-activate whatever services you disabled. Just as a general tip, anytime you make a change like that, write down whatever it is you did so you can back out easier later. HTH!
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