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you have a HDMI port Failure that's not uncommon many people fail to turn the units off before switching cables around it only takes a momentary short on the 5 volt line to one of the other lines and it can short it . or it may just be a normal failure . but you would have to change the .with the AV and HDMI ports on it to restore operation . your set probably has more then one port ? have you tried the others . by process of elimination you have ruled out its the game and cables so it points back to the tv
This could be your video board going bad where your input cables are connected --OR-- the color wheel going bad. Hard to tell without a photo or reference though. Try swapping the cables first... and listen for any winding or whirring sounds.
Is there a input key on the tv itself that you can try to go through the different video inputs or try pressing the channels up or down keys on the tv set. check the owners manual under set up to restart the channel program.
You have your TV in the "Teletext" mode. Go into the TV menu and select the closed-captioning menu and turn off the text function. What you are seeing is the result of the TV's captioning circuit latching onto a false text pilot signal and then throwing up the black box on the screen.
When tv shows dark picture or Lamp LED start flashing at front of tv then you need to replace Lamp. Now let me know do you get blue screen on all video inputs or just on cable / antenna ? It would be nice if can paste picture of tv showing problem to understand easily, like I'm pasting your tv picture as reference.
Sony wega blue dot or star pattern on screen http://esupport.sony.com/perl/news-item.pl?news_id=206&mdl=KDF42WE655 Models: KDF-42WE655, KDF-50WE655, KDF-55WF655, KDF-60WF655, KDF-55XS955, KDF-60XS955, KF-42WE620, and KF-50WE620