I recently built my gaming pc and I have it on my desk right under my tv that is mounted on my wall. I want to connect it to use as a second monitor bit can't figure out how to do it. I tried connecting a HDMI cable between my pc and tv but my tv didn't pick up a signal. I'm not sure if I need another cable for this to work or what but any suggestions would be appreciated. I have an Insignia tv if that helps at all.