Sorry, I had to re-post this as I accidentaly clicked 'problem solved' when I posted it before.
I've just bought a 'Roxio Game Capture HD Pro' to capture footage from my Wii U. The Wii U uses HDMI cables or the old Wii's AV cables and is NOT HDCP protected. I have seen videos on YouTube of people who are capturing from the Wii U using this device. They plug one end of the Wii U's HDMI cable into the output slot of the Wii U and the other end into the input slot of the game capture device. Another HDMI cable is used to go from the output of the capture device to the TV. Also, the capture device has a USB cord going from the output of the device to the PC.
SO, I have downloaded the software that came with the device and launched it in capture mode, plugged in all of the cords I mentioned above, the capture device lit up meaning that it was being powered and the software refreshed itself or loaded a bit to show that it had detected the device, I turned on my TV, switched to the HDMI input mode, turned on my Wii U, AND....nothing. There was nothing displayed in the capture software and nothing displayed on the TV. It also said: "No Signal" in the software like it did before I turned the Wii U on.
As I said before, I know this device works with Wii U, as I've seen YouTube videos of people who have done it. I did exactly what they did and it didn't work. I followed the same instructions as what it is said to do to capture from an Xbox 360, as it works the same way, still didn't work. As I mentioned, the Wii U isn't HDCP protected. I know it's not a problem with the software, because the Wii U isn't showing up on my TV either. I know that both of my HDMI cables are working as when I try plugging each one from the Wii U to the TV normally without the capture device, it works perfectly.
So the only thing I can think of is that the 'Roxio Game capture HD Pro' that I've got is broken, but I don't know for sure.
Can someone help me? Thanks.