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To ensure your Insignia™ - 24" Class F20 Series LED Full HD Smart Fire TV turns on displaying the last used input, you need to enable the appropriate settings. Start by going to “Settings,” then navigate to “Display and Sound,” followed by “Power Controls.” Under “Power On,” select “Last Input.” Next, press the “Home” button, go to “Settings,” then “Inputs,” and choose the HDMI input (HDMI 1, HDMI 2, or HDMI 3) that corresponds to where your cable box is connected. Finally, power the TV off and then back on to validate that it starts up with the correct input and resolution. This should ensure your TV automatically switches to the last used input when turned on. Patricia | Insignia Support
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