just want to add this from mactin,he has had very similar symptoms as jean-luc so i would say its bios not compatible with the new 980x chip

heres quote from mactin

It has been a few days sinse my last post.
Everything is solved. The whole system is up 100%.
I would like to thank all of you who helped me.

What happened ?
I took it to a local computer shop and they updated the BIOS to version F5 using a "spare" i7-920.
They put back the -980x and it worked.

Now I have to make sure F5 is in the spare BIOS. In case there is trouble ever again.
I cant beleive Gigabyte gave BAD information. Well, that's life.
Now, let's start folding