Midi keyboard input not working on D4.2

Hi all. Very excited to have upgraded from 3.5 to 4.2 this morning. MAJOR problem - my midi keyboard input doesn’t work on 4.2. It still works fine on 3.5 ( and other programs). All I did was purchase and install 4.2. I switched and unplugged everything inc the keyboard. Switched keyboard on first. Rebooted. Fired up D4.2 - everything working except midi keyboard input. D3.5 still fine. If I do edit-preferences-play and scroll down a bit, there are no midi input devices listed and no means of adding any! HELP please

THANKS! All working now!