I installed Kubuntu 12.10 from USB, had to edit Grub aswell. Grub appears to be working properly (dual booting with Windows 8). Everything works fine until selecting "ubuntu" from Grub. Screen goes black and my monitor says "Video format not supported".
The USB Kubuntu works like a charm, 1920x1080 60hz. But the hdd-install of kubuntu doesn't. Problem is not grub-related, nor can't i find xorg.conf from /etc/X11 folder.
I'm clueless on where to go next or what to do.