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Upon booting, when I should see the GRUB menu, my monitor simply says: "No optimum mode. Recommended mode: 1600*1200". If I wait for a short while, Ubuntu starts to boot and it reaches the desktop.

So I guess there is no video signal during that time, there's the grub menu but I cant see it and after the wait time everything is fine. I have the same problem when I log out for a short moment, before the log in screen is reached. and this also happens when i shut down ubuntu.

The VGA is an onboard NVIDIA GeForce 7025.

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2 Answers

up vote 3 down vote accepted

The graphical Grub menu does not appear to be compatible with your video card. So let's switch to a text menu instead.

  1. Open the terminal with Ctrl+Alt+T
  2. Paste the below, and enter your password when asked:

    sudo sed -i -e 's/#GRUB_TERMINAL/GRUB_TERMINAL/g' /etc/default/grub
    
  3. Then type sudo update-grub

  4. Reboot and hopefully you get a text menu instead of the screen just blanking out.

Explanation: Here, sed simply uncomments the GRUB_TERMINAL=console line, forcing text mode

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Thank you izx! Your solution solved the whole problem. even the log out and the shut down are fine now! –  hushs Jul 8 '12 at 21:25
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I share the same video card.

Here is a solution:

  1. Open up /etc/default/grub as 'root' (using sudo gedit /etc/default/grub, for example)
  2. Uncomment the GRUB_GFXMODE line
  3. Change the resolution to 800x600 (the lowest resolution for the video card)
  4. Then type sudo update-grub

Here's what I'm talking about. This is an extract from /etc/default/grub:

 # The resolution used on graphical terminal 
 # note that you can use only modes which your graphic card supports via VBE  
 # you can see them in real GRUB with the command `vbeinfo' 
 # GRUB_GFXMODE=640x480

Uncomment the last line and change it to:

GRUB_GFXMODE=800X600
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