Empyrion reforged weaponsJul 16, 2009 · Every 5min the screen turns black and the message "no video signal" (Swedish version) turns up, after a second it goes back to normal. We have connected the TV to a PC via HDMI-cable through NVIDIA Gforce 9400 GT. Operating system is Windows XP Home edition ver.2 service pack 2. if you can help in any way we will be greatful. Tabbert vivaldi 495 he gebrauchtWhy is my smart TV screen black? The most common cause for the black screen is related to the sources the TV is connected to. A loose/damaged/dirty cable, or an inactive power source, a cable from a DVD player/other external sources might be causing the black screen issue. Disconnecting and reconnecting the cables can solve the problem.