A problem has occurred and the system can't recover.

systemctl get-default
sudo nvidia-xconfig --query-gpu-info
sudo vi /etc/modprobe.d/blacklist.conf
sudo vi /etc/modprobe.d/blacklist-nouveau.conf
cd /etc/X11/
sudo mv nvidia-xorg.conf  baknvidia-xorg
sudo mv xorg.conf bakxorg
sudo vi /etc/modprobe.d/blacklist-nouveau.conf
sudo vi /etc/modprobe.d/blacklist-vboxvideo.conf
cd /etc/X11/xorg.conf.d/
sudo mv 99-nvidia.conf ~/
cd /etc/X11/xorg.conf.d/
sudo mv 00-avoid-glamor.conf ~/
dconf reset -f /org/gnome/desktop/a11y/magnifier
dbus-launch --autolaunch=08ff41e3b0bb4761ab35a49082623e2f --binary-syntax --close-stderr
sudo rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
yum --disablerepo "*" --enablerepo "elrepo-kernel" list available
sudo yum --enablerepo=elrepo-kernel install kernel-ml
sudo yum check
sudo yum update
sudo yum upgrade
sudo yum autoremove
yum --disablerepo "*" --enablerepo "elrepo-kernel" list available
sudo yum remove nvidia-kmod-375.26-2.el7
sudo yum remove kernel-headers-3.10.0-123.el7
sudo yum --enablerepo=elrepo-kernel install kernel-ml-headers
sudo rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
sudo yum --enablerepo=elrepo-kernel install kernel-ml
sudo yum update
sudo yum upgrade
sudo yum autoremove
sudo yum  groupinstall "带 GUI 的服务器"
sudo yum install libXfont.i686
sudo yum install libX11
sudo yum-config-manager --disable bendiyuan
sudo yum clean all
sudo yum makecache
sudo yum update