Xubuntu video display completely screwed

[Dave M G]

Charlie,

Thank you for responding.

> xfconf-query -c xsettings -p /Xft/DPI -s -1 
> It should reset the DPI so you can read things again.

Unfortunately, it returned this error:

** (process:5398): CRITICAL **: Failed to init libxfconf: dbus-launch 
failed to auto launch D-Bus session: Autolaunch error: X11 
initialization failed.

What can I try next?

Thank you for any advice.

-- 
Dave M G