Any specialist out there who might know what is happening here and what needs to be looked at

Hello, this is throughout the whole dashboard screen or even when game is played. Xbox360 logo screen on start up seems fine.
Can’t upload a photo… But I get
Vertical pixels, that only in games or in the dashboard are visible, the main screens look OK and also the profile person, to login they have like long strings attached as if the rendering of the person’s would not work.

Does anyone know what needs attention there?

HDMI cable is good since a second xbox 360 does not have this.

Console : xbox 360 slim star wars limited edition.

Please help, since I can’t find any information on this from other sources…