Frequency not supported when booting / Frecuencias no soportadas al arrancar

Question

Edit, courtesy of Google Translate:

I just installed Ubuntu 11.10 with my Windows 7 and when booting I get a black screen with a square moving across the screen that says "unsupported frequencies." After a minute I switch leads to Ubuntu users, but never gives me to choose Windows or anything. I wish I could fix it now that I have all my stuff in Windows and do not want to lose them.

Thanks in advance

Acabo de instalar Ubuntu 11.10 junto a mi Windows 7, y al arrancar el ordenador me sale una pantalla negra con un cuadrado moviéndose por toda la pantalla que dice "Frecuencias no soportadas". Al cabo de un minuto me lleva al selector de usuarios de Ubuntu, pero en ningún caso me da a elegir Windows ni nada. Me gustaría poder arreglarlo ya que tengo todas mis cosas en Windows y no quisiera perderlas.

Gracias de antemano

Answer 1

Maybe your grub uses a resolution your Monitor does not support. I suggest to try the following:

• boot ubuntu

• edit the file /etc/default/grub as root and search the following line:

  #GRUB_GFXMODE=640x480

• if applicable remove the leading '#'

• set the setting to a value supported by your screen. You can as well set the color depth e.g.:

  GRUB_GFXMODE=800x600x16

• invoke the command update-grub as root:

  sudo update-grub

• reboot

Be careful, mistakes in the grub configuration could lead to an unbootable system!

edit: also it might be necessary to increase the time you have for OS selection in grub2, if your monitor is too slow with adjusting grub could be gone before the monitor showed the bootloader menu use the setting:

GRUB_TIMEOUT=

also make sure that the following line is commented out with a leading '#':

#GRUB_HIDDEN_TIMEOUT=0

dont forget to invoke update-grub after editing /etc/default/grub, else your changes wont become set.