Did you try `diskutil eject` - possibly preceded by `diskutil unmount force` to get your DVD back? Certain bugs and odd software interactions require the use o

Did you try `diskutil eject` - possibly preceded by `diskutil unmount force` to get your DVD back? Certain bugs and odd software interactions require the use of the command line to fix on every OS, as do problems that appear seemingly at random. I currently have a Windows 7 installation that started hanging during the boot process at classpnp.sys for about 5 minutes. A reinstall did not fix the problem. If I was a typical consumer, I'd probably send the computer in for warranty service.