You have agpgart, but loading it fails becoze... there is somewhere a pb...
We need to know more... do the following steps in order:
1- try to load the agpgart module with #modprobe agpgart
2 - Then post here the output of the following command:
#cd /var/log;grep -ie '*agp*' -R * &>~/system-agp.log
The last command will create a system-agp.log file in your home directory, post this file to this forum.
We may learn why you agpgart module is not loading.