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To enable close cationing on your TV follow this:-
 Press "Menu" button on the remote control to appear "Setup" menu on the screen.
 Use "Up and Down" arrows on the remote contol to select "Captions/Text" on your screen.
 Press "Right or Left " arrows to select any one of the following options. Caption-1, Caption-2, Caption-3, Caption-4 Text-1, Text-2, Text-3, Text-4.
 Press enter to return TV viewing.
To turn the caption feature to "On" or "Off'
 Press menu key on the remote control to display "Setup" menu.
 Using "UP/DOWN" buttons to select captions on your screen.
 Press "Right or Left" arrow to switch the captions feature 'ON" or "OFF" or "EZ Mute"
 Press enter to continue.
Closed captioning isn't broadcast on every channel and program, so the information may not be present. Since captions are displayed on other channels, you know the set is working properly. If you are on a cable system you can try asking their customer service people if they know anything. But the TV is fine.
this answer has given also to some one had the same problem.
"On your remote should be a button called TV caption or text. Turn off the closed caption as someone hit it and turned it on by accident. If its not on your remote, then it is in the menu." Good Luck
You can also get a user manual at the link below: http://www.retrevo.com/s/Zenith-C27A24T-TVs-review-manual/id/277ag102/t/1-2/
The dark rectangle appears because you have the closed captions on and set to TEXT. Closed captions set to CC1 puts the words on the screen and TEXT puts a black box on the screen. Go into the menu, navigate to the page with closed captions and set your captions to OFF.