I can't seem to get my laptop to extend to my TV. It used to but now it doesn't want to work anymore. How do I debug/check the HDMI card on the laptop. I can see my video card but I don't see anything called an HDMI? I recently upgraded from windows 8.1 to windows 10. I have also upgrade my memory from 4 to 12 gb (added an 8 gb memory card which is working fine). Other than that, no changes have been made.