I used the USB C cable that came with it, which also supplies the power when I connected it to the laptop, but I later replaced it with a shorter cable that I still had and that also worked. Without this, the screen has no power and does not run, so there is no battery installed as I see it. If it doesn't work with the cable, maybe it's the port on the PC or notebook. I think there are always adapters, I would google them, as I don't need one myself, I haven't looked for one.