Firetv box just black

My Mum just got a new tv (Samsung f6000f) and she’s been trying to connect her fire tv box to it, if she tried to connect to navigate to watching on her fire tv box it just shows a black screen, if we disconnect the power it shows that the box is loading up but where it should show the Home Screen it just goes black. We’ve tried factory resettting it but it doesn’t work. We tried connecting it back to the old tv and that works fine. Does anyone have any ideas or experienced this before?