xfce, can't open display

["Daniel Laska" <dalas@web.de>]

Hi!
As a debian-beginner i managed to confuse my system!
I did this: As I wanted to use xfce, i typed: apt-get update with woody (i once had potato).
Then i installed xfce with apt-get install xfce
As this didn't work and i could not run kde or gnome anymore, i decided to apt-get dist-upgrade.
Now, when typing startx, i get: command not found.
When typing startxfce, i get: XFWM message (main type): Error = can't open display.
Does anyone know a way to get it work again?

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