Is the laptop on wifi or internet stick?
Whats the connectivity on the laptop like? It may be that if it isn't strong enough it won't load the videos.
Also have you compared laptop to pc to see whats added on the browser (if anything) thats different? like addons
I can't see the board on the video lessons on my laptop. I can see it on the desktop but rarely in a position to use it! I do have Java loaded - any suggestions?