Can't view output in tty

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http://askubuntu.com – I recently noticed that there was a kernel warning saying that the nvidia driver wasn't compatible with booting into a video mode terminal, so I edited /etc/default/grub, to make it boot into a text only terminal. This worked fine for several days, but now suddenly When I go into a tty I only get a black screen and a flashing cursor. The resolution is also very low. I am actually able to log in and run commands, I just don't get any output, all happens is the cursor moves. What I have tried: Setting it to boot back into video mode - same in a tty apart from this time there were vertical blue (HowTos)