If you are having an issue with the graphical console in
working during a
Centos install, you can use the following steps to fix
Create your VM but do not boot it up.
Get the uuid of the VM
Enter the following command to turn off viridian.
xe vm-param-set uuid="YOUR_UUID_HERE" platform:viridian=false
Boot up your VM. The graphical console in XenCenter should now work.