Can you get to youtube.com and just not play videos? Or are you not even able to get to the site. That's two different issues, the first one just being a problem with Flash not being installed properly.
Right-click/Quit on all programs, especially browsers in your Dock and then reinstall Flash from the latest download of the dmg you can get from adobe.com. Make sure you have this downloaded before you Quit out of all your programs/browsers or you'll have to do it all over again. All browsers must be closed in order for the Flash plug-in to install and activate properly.
1 . Enable Plug-ins
Safari > Preferences > Security
Click in the box for "Enable Plug-ins".
2 . Check whether you are currently in YouTube HTML 5 trial.
At the bottom left of the page uncheck the box for
"You are currently in the HTML5 trial".
thanks for your suggestions. plug-ins are enabled. i reset safari, emptied cache and deleted cookies. the settings for safari, google chrome, firefox and internet and network are identical with both mac's. youtube not even opening on mine in any browser and there are no parental blocks.
also there are no proxies being used. P.S i tried using many different proxies too.
. . .any other guesses??
Still having this problem. . . . .
Flash updated and working properly - tested
No extensions - tested - deleted - off
Safari - updated - deleted all data - and reset
Google chrome - updated
Firefox - updated
Videos playing on other websites (streaming, vimeo, news, all)
Pandora working fine
Youtube - won't open ( message: . . . server where the page is located isn't responding)
Youtube videos on Facebook - won't open
Facebook - all other videos (except youtube) - play just fine
Google translate - won't open ( message: . . . server where the page is located isn't responding)
Google doc's (attachments in email) - won't open
Same problems occur with other users on my Mac Guest1 . . . Guest2
No problems with other Mac's or PC's or iphones using the same network (2 seperate homes and 1 work and public networks tested)
other Mac's have the exactly same settings in "System Preferences" - all boxes checked the same
Somebody must have other suggestions?!?!?!? Please
Back up your personal data as a safety measure.
Go to to Library->Preferences->SystemConfiguration
Rename NetworkInterfaces.plist to NetworkInterfaces.plist.bak
Rename preferences.plist to preferences.plist.bak
Reboot the laptop.
To get to Library hit Go/Go to Folder and type in /Library in Finder.