Sounds like you installed proprietary video drivers like the ones from ATI or nvidia and these are kernel release specific so do not survive a kernel update. If you look at the ELRepo repository th... [by TrevorH]
You cannot run kmod-nvidia with a non-CentOS kernel. You will need to download the proprietary binary drivers from nVidia and install those and then reinstall them every time you update your kernel. [by TrevorH]
First you need to install kmod-w83627ehf-0.0-3.el5.elrepo kernel module from ELrepo 3rd party repository (there is also one for Xen kernel). Make sure you configure yum-priorities plugin whi... [by milosb]
Not sure how I ended up with this but on my CentOS 6.0 system (recently updated to 6.1) I had the ELRepo kmod-nvidia drivers installed. For some reason this had created a config file /etc/X11/XF86C... [by TrevorH]
These are procedures for installing in Red Hat Enterprise Linux 6.5 the ElRepo RPM package 'kmod-nvidia', and for sucessfully using nVidia GTX645 OEM graphics card/GPU with nVidia's proprietary software . These procedures apply to RHEL 6.5 64-bit operating system.