Virtual TTY scrambled

Hi,
On a Sony Vaio laptop, pressing CTRL+ALT+F2 for instance gives me a blurred terminal with the issue message and login prompt repeated six times on the screen. That is two columns with three each.
The screen is blurred and unusable.
Any idea?
thanks
On a Sony Vaio laptop, pressing CTRL+ALT+F2 for instance gives me a blurred terminal with the issue message and login prompt repeated six times on the screen. That is two columns with three each.
The screen is blurred and unusable.
Any idea?
thanks