Just purchased via auction and found that the multimedia screen rolls on its own. Pressing the buttons on the side does nothing and while scrolling pressing the touch screen does nothing.
had the car running for maybe 10 minutes or more and the screen was stable and the buttons on the side switched between modes ie satnav and when using the touch screen it works. Turned off the car and the touchscreen started rolling again and the touch screen did not work when pressing.
Any thoughts appreciated.

 

I'm gonna admit, I have no clue what do you mean. I never knew the screen can roll in the first place.
Also what do you mean by multimedia screen? Are we talking the stock head-unit?