Youtube not working on macbook pro [closed]

Can not open any video on Youtube with safari or google chrome or firefox may be after updating to Yosemite. Do not know.

"youtube page/website is not loading properly in Safari. The thumbnails of videos do not appear; the comments under the videos never finishes loading; and some of the buttons/links (i.e. load more, show more, etc.)"

I will try to describe. On the top left is written YouTube. Below that there is a rectangle with question mark in it. This rectangle is partly hiding the word signin. Below this there is a small square and below that there is word Upload and ajjacent to that a small retangle containing the word signin, Below that there is a big blank retangle, Below that a small retangle with word Search, Below that a blank small retangle. Below that there is number bullet with What to Watch. and so on.