USB Input has no choice for Video. My USB Memory Stick has pictures, software, text etc. installed. Pictures in the picture folder all display perfectly. It displays the Video folder name but says folder empty. I have installed .FLV - .AVI - .MP3 - .MP4 - .WMP .VOB - .3GPP Videos. None are detected by the menu. The TV plays direct from the computer via HDMI port. Which format should I use or am I not using the correct menu?