owenm it sounds like you did an update and installed a new kernel and did not install the graphics driver for your card
What is your 3d card ( ati,nvidia) ?
or is it a built in chipset on the mobo ?
What driver did you install ?
Was it from the manufactures web site ( ATI catalyst -ati-driver-installer-???.run or nvidia.run )
or was it a kmod.rpm ?
what was the last updates , they are listed in " /var/log/yum.log"
Code:
tail -50 /var/log/yum.log