You can search the answer with google... or maybe try to edit /etc/inititab
change:
# Default runlevel. (Do not set to 0 or 6)
id:3:initdefault:
Into:
# Default runlevel. (Do not set to 0 or 6)
id:4:initdefault:
So 3 becomes 4 which is the runlevel for X.
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