Has anybody having trouble with IMBD trailers? When try to view IMBD Trailers click on trailer and does not load .Have no trouble with viewing Movieplayer.it

If you're using Firefox with AdBlockPlus, that's why you just get a black screen.
You can either disable adblock on imdb.com, or you can go to the adblock menu, click Open Blockable Items.
The first red item that shows in the list (it ends with js/ads.js ), right-click on it and click Disable Filter. (disabling this may or may not effect adblocking on other sites)
Reload the page and the videos will load and ads will still be blocked.