Youtube No Video But Has Audio Sound



When I view videos on YouTube, I can hear the sounds but no video is displayed. I have another computer with identical setup and YouTube is working fine without any problems. Does this YouTube no video problem was caused by a virus? I can watch online videos on other web site except YouTube. As far as I can remember, the problem started few weeks ago. It has been and an on and off situation. But now it is totally not displaying a video. I need help to resolve this. Thanks

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