X server crush.

  I don't know what is signal 4, but I belive you can get it from manual 
of kill. I had once problems with install of previous versions of RH 
Linux, when the CD media was bad, and I was catching signal 11 if I 
remember well, and after that all install was going down, and system to 
reboot.
  I do belive it is going to be much easy for you if you try to reinstall 
the rpm from a trustly media, and more than this, if you compile by 
yourself the X server.

  best regards,
  Bogdan