Thank you, all.

That's it ! I finally managed to install a BSD system (pcbsd).
Emotion is such that I have tears in my eyes...
Think, since the time I try.

For those interested, the problem was well on my hardware.
Apparently, unlike other os, BSD is very sensitive to the way which the DVD players are installed ...

The title is just a joke. I'm glad to be here and intend to glean as much
knowledge from you all, as I can.