When I got this message: on my monitor (Philips 150S): "Cannot display
this video mode. Change computer input to 1024x...@60hz." on a black
screen, I just edited one line in the file /boot/grub/menu.lst :

From:  /boot/vmlinuz-2.6.27-7-generic 
root=UUID=93c481f7-14b5-4336-85ce-be54327fb066 ro quiet splash
To:      /boot/vmlinuz-2.6.27-7-generic 
root=UUID=93c481f7-14b5-4336-85ce-be54327fb066 ro vga=773  

Save the file, and reboot. You'll now see all the kernel messages scroll
by. Nice. On other monitors the vga mode may be different, i.e. 791. You
can find the relevant numbers here:

http://en.wikipedia.org/wiki/VESA_BIOS_Extensions#Linux_video_mode_numbers

Scroll down to "Linux video mode numbers" almost at the bottom of that
page and try out the relevant numbers. Problem gone.

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cannot display this video mode
https://bugs.launchpad.net/bugs/197681
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