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I am new to Linux as of yesterday. I know nothing about it, but I am very excited to learn! Glad to be here!

I've been running Ubuntu 13.10 Saucy Salamander since yesterday and haven't had any problems at all until this morning when I tried to watch a video on YouTube and could not help but notice that video no longer plays on this computer, but the screen simply goes dark for about a minute as soon as the video is loaded, then springs back to light -- and the video does not play at all. I am not surprised to see this at all, after all, this is the world of computers where everything goes wrong ALL THE TIME FOR NO APPARENT REASON AT ALL! ;-) Anyway, I find this very strange, since I haven't changed any settings yet, and since it was working like a clock last night! What's up with this?

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