I've tried to put a HDMI cable in to watch my YouView box and also a friends Playstation 3. Both times the TV screen flickered on briefly then faded out to a black screen. No matter what I then press on the TV or press on the remote the screen won't change, the TV won't do anything at all and it seems as though its crashed. I have to remove and replace the power cord for the TV to reset itself then come on again. It switches back on as normal but quickly does the same thing if the action is tried again.