I see it asked a few times online. The sega picos pen has an audiable click, but there is no response on screen. Well im here to say that despite the click the button inside is just bad. To open it you need to remove a screw under the pens sticker. Its at the very top close to the wire side of the pen. Remove the screw and youll be able to unclip the pen apart. Inside youll find a button cell. If you depress it and check contutity across the contacts youll find that there is none. Replace that button and youre golden. I hope any who come across this save themselves troubleshooting time.