How to prevent the white 'flash' on page load?

Why won't youtube videos load on the actual page?

• When I click on a video the entire page will load. Everything on the page will load except for the video, its just a black box. The videos will load when they're embedded on other websites and from the uploader's channel page though. I don't get it. I've tried emptying my cache, restarting my computer, and I've checked for flash updates but flash should be working if I can get the videos to load when they're embedded, right? Any suggestions?

• Answer:

  youtube's videos won't work unless you have a fast internet connection. i have att dial-up, but the videos on youtube won't work. u will need a faster internet connection like high speed internet.