red hat linux is stopped at loading bar after restart

[root@rac2 ~]# mount /dev/sr0 /media/
mount: block device /dev/sr0 is write-protected, mounting read-only
mount: /dev/sr0 already mounted or /media/ busy
mount: according to mtab, /dev/sr0 is already mounted on /media
[root@rac2 ~]#
[root@rac2 ~]#
[root@rac2 ~]# cd /media/
[root@rac2 media]# ls
32Bit  AUTORUN.INF  cert  runasroot.sh            VBoxSolarisAdditions.pkg        VBoxWindowsAdditions.exe
64Bit  autorun.sh   OS2   VBoxLinuxAdditions.run  VBoxWindowsAdditions-amd64.exe  VBoxWindowsAdditions-x86.exe
[root@rac2 media]# ls -lah
total 51M
dr-xr-xr-x.  6 root root 2.0K Jan 20 03:46 .
dr-xr-xr-x. 27 root root 4.0K Jan 28 13:52 ..
dr-xr-xr-x.  2 root root 2.0K Jan 20 03:46 32Bit
dr-xr-xr-x.  2 root root 2.0K Jan 20 03:46 64Bit
-r-xr-xr-x.  1 root root  647 Aug 20 21:47 AUTORUN.INF
-r-xr-xr-x.  1 root root 6.8K Jan 20 04:41 autorun.sh
dr-xr-xr-x.  2 root root 2.0K Jan 20 03:46 cert
dr-xr-xr-x.  2 root root 2.0K Jan 20 03:46 OS2
-r-xr-xr-x.  1 root root 5.4K Jan 20 04:41 runasroot.sh
-r-xr-xr-x.  1 root root 7.2M Jan 20 04:41 VBoxLinuxAdditions.run
-r-xr-xr-x.  1 root root  17M Jan 20 05:42 VBoxSolarisAdditions.pkg
-r-xr-xr-x.  1 root root  17M Jan 20 04:45 VBoxWindowsAdditions-amd64.exe
-r-xr-xr-x.  1 root root 309K Jan 20 04:40 VBoxWindowsAdditions.exe
-r-xr-xr-x.  1 root root 9.8M Jan 20 04:41 VBoxWindowsAdditions-x86.exe
[root@rac2 media]#
[root@rac2 media]#
[root@rac2 media]#
[root@rac2 media]# ./VBoxLinuxAdditions.run
Verifying archive integrity... All good.
Uncompressing VirtualBox 5.0.14 Guest Additions for Linux............
VirtualBox Guest Additions installer
Removing installed version 5.0.14 of VirtualBox Guest Additions...
Stopping VirtualBox Additions [  OK  ]
Removing existing VirtualBox non-DKMS kernel modules[  OK  ]
The following X.Org/XFree86 configuration files were not restored, as they may
have been changed since they were generated by the VirtualBox Guest Additions.
You may wish to restore these manually.  The file name in brackets is the
original version.
  /etc/X11/xorg.conf (no original)
Copying additional installer modules ...
Installing additional modules ...
Removing existing VirtualBox non-DKMS kernel modules[  OK  ]
Building the VirtualBox Guest Additions kernel modules
Building the main Guest Additions module[  OK  ]
Building the shared folder support module[  OK  ]
Building the OpenGL support module[FAILED]
(Look at /var/log/vboxadd-install.log to find out what went wrong. The module is not built but the others are.)
Doing non-kernel setup of the Guest Additions[  OK  ]
Starting the VirtualBox Guest Additions [  OK  ]
Installing the Window System drivers
Installing X.Org Server 1.15 modules[  OK  ]
Setting up the Window System to use the Guest Additions[  OK  ]
You may need to restart the the Window System (or just restart the guest system)
to enable the Guest Additions.
Installing graphics libraries and desktop services components[  OK  ]
You have new mail in /var/spool/mail/root
[root@rac2 media]#
Broadcast message from root@rac2.localdomain
        (/dev/pts/0) at 14:05 ...
The system is going down for reboot NOW!