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When I usually boot linux it automaticly opens the graphic mode, but now it boots in the textmode, how I can switch this back, because I have absolutly no idee how to go from text to graphic mode or the other way around...
I think Mandrake has a runlevel in /etc/inittab, the same as everybody else. I think their gui level is '5'. So edit that file.
As far as switching, 'startx' is the usual way to go from console to gui. A normal exit from the window manager should take you to from gui to console (ctrl-alt-backspace is the violent way) but a lot of graphical login managers trap that and leave you stuck in the damn gui.
The standard way to move from one to the other without actually exiting X is to do 'ctrl-alt-f?' which will take you through the terminals, 1-6 usually being text and 7 usually being gui, just like 'alt-f?' takes you through the terminals once you're out of the gui.
I boot to console by default and do startx to get to X because xdm, gdm, kdm, and all that stuff is a pointless annoying waste and, if your X gets screwed up, you get entirely screwed up. With console and startx and ctrl-alt-backspace working, no gui problem is any big deal and movement from one to the other is easy.
Man I'm slow. Sounds like you need to run xf86config or xf86cfg or something and set up your X again, or look at your XF86Config file and see if anything looks funny. But I really don't know about Mandrake. I ran it for a couple of days, but that's it.
Well, like I say, I don't know what resources Mandrake has for setting up X. If you're at a command prompt, you can type
assuming that's on your system, which it probably is, and follow the steps that it presents to give information about your hardware. Or type
which will pop up a minimal graphics environment in which you can try to configure it that way. It could be something else, but 'no screen found' usually just means it has no idea what or where your display is. So you have to say 'I've got this monitor and this video card and want this resolution' and so on. But there may well be some Mandrake wizard that you can jump start from the command line, so you might want to look for something like that or wait for an actual Mandrake user to come along and pitch in.
I initially thought you were just having difficulty getting in and out of X and thought I could help with that but, if you're having problems getting X to run properly even when activating it properly, it's a bit more than I thought.