The stone seems to be viewed slightly from above, while the wires and screen are viewed front-on, so that doesn't help them fit together.
Various ideas for integrating the two:
Instead of having the wires disappear behind the stone, show them going in at the side.
Repeat visual elements on the stone and the screen:
- similar shapes
- rune frame around the screen following its shape, but glowing/red instead of stone-coloured
- bars and diamonds faintly etched into the stone
Have the screen cast light onto the stone to help show they exist in the same space. Have both cast shadows as well, so that they don't look so flat.
Show additional wires, chips, etc of various sizes outside of the stone to show the complex work required to connect to it without breaking it.
Have the two wires from the screen connect to the stone in different places instead of just one, to suggest a complex, purposeful connection rather than just "jam the wires in" and to increase the chances of them being noticed by the viewer.
Have the runes glow with the same colour as the screen when in use.
Unless the screen is attached to something else next to the runestone, maybe have some brackets fixing it to the stone, to further visually cement the connection?