Why is my Dell inspiron 15 3000 not playing movies or videos through the internet

[natheerbad]

Why is my Dell inspiron 15 3000 not playing movies or videos through the internet?
It used to work, through the wifi but right now it doesn't seem to play and the wifi is working the videos just aren't working

 

[rgd1101]

movies or video from what site?
which browser are you using? some browser block flash player by default