if you were using the nvidia.run driver you are now using the nouveau driver
or do you have the nvidia.repo installed ?
( it dose not look like it )
were you using the "kmod-nvidia.rpm "
nvidia DID kill off the use of 4 monitors , but 3 are still able to be used
from the last post you ARE using the centos 6.x repo
and have auto updates enabled
this will auto upgrade the install
but if you have conflicting repos installed and enabled
??? there might be some nasty complications ?? maybe
a list of files in the /etc/yum.repo.d folder is only part of the needed info
the output of this is what is needed
yum repolist all
if "epel-testing.repo" is turned on ??? there can be some very nasty problems if you are not taking the NEEDED precautions
the same goes for " CentOS-Vault.repo" the vault is the old and now dead versions of centos
this can cause big problems if it is enabled all the time
and "remi.repo" can cause rpm incompatibility issues
do you have "yum-priorities-plugin" installed ? AND CONFIGURED !