>When I boot the machine with Celena a large black square occupies about one quarter of the screen with an error message: err 8.
Solved, I think. I followed the posted instructions for "Linux Mint 3.1 Celena Upgrade Instructions" and...it worked! The boot error message is gone.
>Other bug here, I have no splash picture when booting and when shutting down.
OTOH, I also experience this same bug on my Dell 3000 (this bug also exists on Ubuntu, by the way). So far, the only linux distro that shows the splash picture during boot with my machine is Freespire 2.0. No matter, the posted upgrade instructions eliminated the boot error issue.