A sudden burst of electrical energy can overwhelm the electronics inside a television set and force automatic safety measures to initiate a shutdown of key functions. You can repair a TV that has been affected by a power surge and is no longer functioning correctly by resetting it to the default state it had when first leaving the factory. The procedure does not involve any special equipment and will not harm the TV.
Unplug the TV's power cord from the wall outlet providing it with electrical power. Unscrew the coax cable attached to the cable box or satellite receiver from the "Ant" or "Coax in" port on the back of the TV.
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Plug the TV's power cord back into the wall outlet. Turn the TV on with the front or side control panel. Press the TV's "Menu" button to go to the main menu onscreen. Select "System Settings" or "Settings" -- the actual name may vary slightly, depending upon the manufacturer of the TV.
Select "Options" or "Advanced" from the menu that is now on the screen. Select "Factory reset" or "Factory default" from the list of choices presented on a new screen -- the actual name may vary slightly, depending upon the manufacturer of the TV.
Highlight "Yes" or "Continue" on the "Confirmation" pop-up window that appears. Press the "OK" or "Enter" button on the TV (the actual name may vary slightly, depending upon the manufacturer of the TV) to reset the TV.
Turn the TV off once the screen has gone black and it returns to the main menu screen. Reattach the cable to the port on the back it was removed from earlier.