I am loading a server from the CentOS 6.7 ISO and then upgrading. After loading at release 6.7, the machine behaves normally. After running yum update, the X server will not start. Attempts to start it manually result in one of the following messages depending upon which OS is loaded. I initially loaded it as 64 bit and when that did not work I tried the 32 bit version of the OS. The graphics card is part of the motherboard so swapping it out is not an option. This is a server and there is no AGP slot. X: symbol lookup error: /usr/lib64/xorg/modules/drivers/mach64_drv.so: undefined symbol: xf86LinearVidMem X: symbol lookup error: /usr/lib/xorg/modules/drivers/mach64_drv.so: undefined symbol: xf86LinearVidMem I yum grouperased the X Window System and Desktop and then groupinstalled it with no luck. I then changed my repos to point to the original ISO, but there were too many dependencies broken to get the system to groupinstall the X Window System and desktop. I tried forcing in just the driver, but it fails with a message about the driver being at a different release than the X server. I am planning to reload the OS and use the Yum Exclude to keep the Xorg pieces. Unfortunately, that will probably break a lot of dependencies. I downloaded the source for the driver from Xorg, but need to find a lot more stuff to get it to compile, and even then, it is likely not to work. Does anyone have any more things to try? Yes I know the mach64 is an old video card, but that is what is there. Since CentOS just follows the upstream source, I am not sure where to file a bug. Not that that is likely to help. I am batting 0 for 5 over the last decade and a half getting anything fixed. Bob Styma