help getting my unubtu/woody working again

[Henning Sato von Rosen]

Hi!

after doing apt-get update, upgrade, and dist-upgrade, my computer
shows just a blank screen and a mouse pointer at start-up.
sources-list contains the usual woody lines plus universe, testing and
marillat.

I am sure the above thing was an utterly stupid thing for a linux
newbie to type (I was trying to install mplayer)

-- I would be most thankful if somone would point me to some Fine
Manual to begin or otherwise hint me on whar to do.

I really need my otherwise lovely ubuntu/debian/gnu/linux system up
and working, so I 'm most thankful for any help on this.

Regards/Henning