The first choice:

vi /etc/inittab

modify the lastline's number "5" to "3"

id:5:initdefault:

run level:

0: halt

1: single user mode

2: multiuser mode, no network(NFS)

3: multiuser mode, have network(NFS)

4: reservable

5: multiuser mode, network(NFS), graphic(X11)

6: restart