Start up problem - led navigation screen lights up but nothing else

Hi there
Issue regarding the Elektron Machinedrum SPS - 1 UW (bought secondhand). I have owned this for 2 years now and never had a problem until now. When I turn the machine on the LED (navigating) screen lights up however nothing shows up. Not even the Elektron logo comes up… All the sounds are still there and the functions seemed to work but nothing on the navigation screen. I have tried opening it up and seeing if anything is disconnected but doesn’t seem to have any problem there… I also tried restoring to factory settings but nothing has changed…
I do recall that there was a startup problem when the screen froze with just the elektron logo displayed but that didn’t happened again.
Any technical advice would be greatly appreciated. thanks!