Are you able to login via ssh from another machine? By running "top" you should be able to see which process is running on the CPU.
Does this happen if you use the open-source drivers (ati instead of fglrx)?
Are you able to login via ssh from another machine? By running "top" you should be able to see which process is running on the CPU.
Does this happen if you use the open-source drivers (ati instead of fglrx)?