Thanks Rixter,
As a matter of fact, I have tried isos too. I get the same result.
Just maybe the append line wasn’t exactly the same as yours.
I thought that booting isos with memdisk was relatively a new thing?
I am now in the process of completely reinstalling the server on Ubuntu 10.04 (it was running on 11.10).
I’ll give it a try as soon as I’m up and running again (in between other projects).
Thanks again!