Thanks. I got -4007-oem to run. At boot it presented correctly with a login box on the external screen and the laptop screen available. However when I logged in both screens went blank for a bit after which only the laptop screen was alive but it wasn't the primary so just blank. Right clicking allowed me to get the "Display" GUI and fiddle around. After poking buttons a bit I could get the external screen to come alive but it was pretty mixed up so I have reverted to the -1008-oem. I am using xfce rather than gnome. Regards, John On Mon, Dec 28, 2020 at 9:30 PM koba