Jag xj8 Auto box gear selection

[ProperSticky]

I have a '98 Jag xj8 with a gearbox problemand that is, if i put it in drive nothing happens yet if i put it n neutral i get all drive gears it will change up and down the gears no problem, there's no limp mode of anything, but i car engage reverse either.
With no limp mode can i be a gearbox problem or ( as im hoping ) its the selector in the cabin ?