Mxu 150 stuck in reverse, won’t start

[Claytonl2010]

Recently bought a mxu 150 farm quad as a non runner. Have found on inspection lcd screen doesn’t work, gear selector moves freely but is not registering as out of reverse. I’m guessing this is the reason it won’t fire up, does anyone have any advice on what could be causing the problem

[Rightside]

I would tear into the clutch and look for obvious issues. Shift shaft may need looked at too.