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There is nothing you can do to this set now. The only thing you can do, is to make a hard reset to this set. Just unplug it from AC mains socket, and replug it after a while. If this do not help you, just contact any experienced service technician.
Check your closed-caption settings and be sure they are turned off. If captioning is set for text mode you can have this trouble. The TV blanks out a part of the screen for the text it never gets to display. Once captioning is shut off (or set for normal caption mode if you want to use it) the black box will be gone.
For the first one, please list the model number and count the blinks. Also, can you please post each problem separately. It will get too confusing trying to address 3 sets with different but similar problems.