I got this after upgrading to 11.04 with some issues. It must be tty7, since Ctrl+Alt+7 does nothing. I can change to tty[0-6] to make the screen look normal, and changing back makes the screen black.
What is happening here? It's like it thinks I have X installed.
Thanks.
Temporarily edit your grub boot settting: remove
vga=something
and replace it withnomodeset
. If you can boot normally to the desktop, do your troubleshooting and perhaps install/uninstall proprietary graphics driver or maybe remove any unsuitable graphics option.