Why videos on YouTube randomly don't work?

Ok so I am a Youtube fanatic I spent 95% of my time online on Youtube, but suddenly it wont work on my computer, it loads a fraction of the video and then just stops, it only starts loading again if I hit play... I thought this was a computer problem...

i want to watch some youtube videos but some say it no longer is available while others can watch it it is only on some like the new nigahiga video i have only found 3 that say that

i tried it using many videos but doesnt show up help please

I have a brand new hp laptop, and when i first got it i could watch youtube videos fine, and actually now that i think about it, it started off slow. Some of the videos i wanted to watch would just say, sorry this video is no longer avalible, but now...

everytime i click a video theres no video there just blank where the video suppose to be

Since yesterday, Youtube videos worked, but today, all i get is a black screen. Everything load as usual but the video just wont load. The only thing that works is by typing the youtube adress as https://www.youtube.com. But I was able to watch videos...

ok so when i go to use windows media player i click it it opens a white screen for litterally 1sec and shuts itself down youtube videos the picture of the video u click on to watch the video is white and blank then the video itself is completely black...