X server failed to start, "fatal server error: Server is already active for display 0"

Solution Unverified - Updated -

Issue

  • Error message while attempting to start X server:
Fatal server error:
Server is already active for display 0
    If this server is no longer running, remove /tmp/.X0-lock
    and start again.

Environment

  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • xorg-x11-server

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