Here's the deal - I've got a pretty huge archive of various gaming related videos, some of which are no longer available to download from anywhere, and this is a issue that's been bothering me for quite some time. I have a Samsung Green 1TB drive, that's completely free of any faults, so disk corruption isn't the issue - just to put this out in front. The issue is - some videos lost their visual, but retained sound. Basically, it opens and plays normally ( you hear sound ), but the screen is black and the video isn't shown in media player. I've no idea why this happens, but this seems completely random. Any ideas/clues ? Cheers.