I found a possible reason of the problem.

Installed Ubuntu 11.04 with an other monitor, installation w/o problems.
Text mode okay, X okay.

Changed monitor (moved the computer to my normal workplace), booted and
saw an error message of my monitor saying "Frequency out of range".
Heard hard disc activity and waited until X starts. No problem in X, but
whenever I changed to text mode with Alt-F1 to Alt-F6, "frequency out of
range".

Sounds rather similar to this bug.

After digging two hours in the log files, I realized that grub caused
the problem. So I added a line GRUB_GFXMODE=800x600 to /etc/default/grub
and ran sudo upgrade-grub. Rebooted and the problem was fixed for me.

In my problem, grub was the culprit.

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https://bugs.launchpad.net/bugs/786563

Title:
  "Input Signal Out Of Range" in textmode

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