Is it "black" or "blank" ?
Have you tried a different browsr ?
What happened when you watched the video - did a player (e.g. WMP, Real player...) pop up ?
How did you get into "Full Screen" ?
I just got a new Gateway laptop with an HDMI port and Vista. Everything was awesome for the first few days, but now when I try to watch any embedded videos in fullscreen, the whole screen goes black. This is really annoying, as I have been enjoying using it to watch Hulu through my Samsung LCD. Any ideas?