I'm having a problem with LIVE youtube when watching on TV (via a ROKU Premier attached w/an HDMI cable attached to the TV).

SOURCE: Won't play anything on youtube.

I figured it out. (Or accidentally fixed it) First I reset the temp files

Main menu>System>Repair and Formating Tools> Clear temporary system files and cashe
This didn't erase any of my content... though I did lose my extra favorites links.

Then I happened to open the browser and check the settings there. I noticed that "flash content" was disabled. I fixed that, and it works. (As sad as it sounds, I don't think I needed to erase the temp files. But it works nonetheless.)

SOURCE: Periodic tv screen blackouts

The problem is your cable box. I know you said you replaced it, but I work on TV's everyday and, sorry to say this but cable box HDMI outputs have serious issues, like no or intermittent sound and video. I have seen customers exchange their cable boxes 5 and 6 times and still have the problem. Your best bet is to use the component outputs of your cable box, visually you will not see a picture difference between component and HDMI when using a cable box. Your other solution is to get satellite; I have NEVER seen an HDMI issue with a satellite box

SOURCE: real player not streaming youtube videos....

This problem is caused by the phone not Identifing the itself propery to the wifi router, there is no real soloution, you can however try 3rd party appliactions like emtube mobituba but these constaly have problems the format as youtube constantly change the format to stop these apps. the only other method is to use you Data plan to view YouTube.

SOURCE: Youtube video player keeps flashing to small screen to big screen.

please read this information
http://help.youtube.com/support/youtube/bin/answer.py?hl=en&answer=56115

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SOURCE: Toshiba 32AV500U HDMI issues

The Toshiba 32AV500U cannot display 1080p. Hook up your PS3 to your computer monitor, provided that it can display 1080p, or some other TV that can, then change your Video Output settings under Settings> Display Settings and uncheck 1080p, which will allow the PS3 to display in 1080i. Once you do that, then hook up the Toshiba via HDMI and it will work with no problem.