My laptop works fine when connected to a projector for powerpoints etc. But when I tried to connect to the TV with an HDMI cable, the display on the TV screen did not match that on the laptop screen i.e. the TV showed a weird version of my desktop screen - icons along the bottom taskbar but but no program icons on the body of the screen, whereas the laptop was showing the programme I wanted to watch from catch-up TV. Any ideas where I've gone wrong?