On 2014/09 updated t1, t2, t1hilo to lastest centos 6.5 ( from centos 6.2), There are the procedure I followed. Need to remove openoffice as it had a conflict with the update yum could not resolve. And centos 6.5 works OK with stock video driver, so nvidia 3rd party driver was removed. 1. Yum update Remove openoffice due to conflict with update, then update yum remove openoffice.org-brand openoffice.org-calc openoffice.org-calc-core openoffice.org-core \ openoffice.org-draw openoffice.org-draw-core openoffice.org-graphicfilter openoffice.org-impress \ openoffice.org-impress-core openoffice.org-langpack-en openoffice.org-math openoffice.org-math-core \ openoffice.org-opensymbol-fonts.noarch openoffice.org-pdfimport openoffice.org-presenter-screen \ openoffice.org-ure openoffice.org-writer openoffice.org-writer-core openoffice.org-xsltfilter yum update vi /etc/rc.local // comment out pmac driver vi /etc/inittab // set run mode to 3 reboot Remove nvidia drive (will use stock video driver now - as desktop now spans the 2 monitors) cd /home/tcs3/public_html/tcs3/computers/linux/1205_nvidia sh NVIDIA-Linux-x86-295.40.run --uninstall delete the /etc/X11/xorg.conf files vi /etc/inittab // set run mode to 5 reboot (X should be working) 2. Recompile/install new TCS to /home/to Recomile & install new TCS binaries to /home/to. vi /etc/rc.local // comment IN pmac driver reboot start the TCS