8” HDMI - Not working?

Hi group, doing my first ever build of a retropie, bought the 8” HDMI with the display driver but I can’t get anything from it whatsoever.

Am powering it using an external 5v adaptor. But everytime I’m getting just black screen.

I’ve done all the steps making the changes on the config.txt but I’m pretty certain there’s just no connection whatsoever. Am I supposed to get any sort of light or indicators on the boards to let me know if there’s any juice going to it at least or have I got a dud on my hands??

Thanks in advance!