I had a lot of trouble getting it to power up at first. Make sure you line up the USB C port on the daughter board with the RPI5, then make sure the micro HDMI are lined up, but apply most of the force on the side where the USB C port until you hear it click into place. There is a convenient notch on that side by which to push. It takes more force than expected but once you hear the “click”, you are good to go. It took me three tries to figure that out.