a blog about web apps, Lisp, Rails and all the REST ... Booting RHEL 5 or Centos 5 for the first time in Parallels Desktop (build 3188) wil get you an instant kernel panic. Just include agp=off as a kernel parameter and the system boots and works like a charm (use 'a' at the Grub screen to edit the kernel parameters). Afterwards you can edit the /etc/grub.conf to include agp=off by default: title