I just bought a new Lenovo Y510 laptop. I installed lastest versions of firefox and adobe player. The full-screen function in youtube does not work. I can hear audio but does not show anything - black screen. I uninstalled Firefox & Adobe Player and reinstalled. Works fine in IE but not firefox. Even installed latest Shockwave & Java. Still no luck. ANy ideas? Thanks
Your machine is fine so is Firefox. As you can see from the Google link below, be glad it's nothing more than a YouTube problem itself :-)
http://www.google.com/search?source...
i_Xp/VistaUser