I have a Dell Inspirion laptop and a Samsumg TV. I've connected my laptop to my TV via HDMI before, I have also connected my laptop to other TV's before. The HDMI cord I am using is the one I use for my Xbox. So I know the ports work and the cable is fine. Just when I try and plug in my laptop it gives me a "no signal" message. Not sure why it just all of a sudden stopped working. I havn't changed any settings or anything. Yes, I have used the control panel to switch to external monitor and yes I have used the Fn key. None of it has worked.