Recently my RHEL upgraded from 6.1 to 6.2 for my Parallels instance. Upon reboot, the boot sequence stopped immediately before the X server takes over My suspicion was that the Parallels video driver needed to be reloaded, since X was updated in the 6.2 upgrade. I performed the following steps, and successfully resolved the issue 1. I interrupted the boot by "pressing any key" 2. I edited the command line, changing quiet to verbose (so I could see any errors. 3. I booted to the single-user prompt 4. I mounted the Parallels Tools CD ROM image onto a directory I made (/media/PT) mount -o ro,exec /dev/sr0 /media/PT 5. I installed (upgraded) Parallels Tools /media/PT/install 6. After installation, I continued the boot and had a "good" RHEL6.2 operating image.
