Lately i changed my computer's screen resolution (Linux ubuntu) all of a sudden the screen goes black, with the error message "Analog out of range 74.1 Khz / 60 Khz" in the middle. I can access the log-in screen, but after that its nothing. Does anybody know how i could fix this? help much appreciated!

Did you try pushing the monitor pass it limit of RES?
Did you try changing out the Video card or overclocking it?
Did you change something in the OS driver for Video?

Pretty much that's the cause of why you see that message.

He knows that. He wants to know how to set the screen resolution down so he can use his computer again. If this was a Windows machine I'd delete the video driver forcing the machine to use the default driver and to ask ask me for a new one.

I don't think i can manage to configure anything in that way since i can't really access my computer without seeing anything...
But i got this idea, if i try to connect my other monitor and use that one to lower the resolution, then i can use my current one again. Might just work, on the other hand, it might just go the same way with the other monitor

Sounds like a pratical solution.

Okay that worked can finally begin figuring out stuff with my linux...

You could have hit ctrl-alt-backspace to get dumped back to a command prompt, then done some fancy editing of files, probably in your xorg.conf but I don't know for sure.

I had a similar problem after attempting to connect a Billion ADSL2+ router to my Windows XP machine. Another member of this community suggested booting and clicking on F8 just before the Windows XP screen appeared. I then enabled VGA mode and reset the screen settings ... and it worked! Hope something similar may work for you.

Do "sudo dpkg-reconfigure xserver-xorg", fill in all of the various options (read it carefully). Have exact horizontal and vertical refresh parameters for your monitor to hand. If you don't get these exactly right, expect a black screen again. Auto detecting the monitor may not work as you've already had problems. Once you're done and saved a new xorg.conf, do CTRL+ALK+BKSP to kill the X server.

It should bring you back to the GUI login.