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If none of the button are working then it could mean that one of the buttons is stuck or there is an issue with the board on the monitor itself.
Unplug the monitor from power and the computer. Make sure none of the buttons are stuck down, plug only power back in to the monitor and see what it shows. Plug it back into the computer and check to see if the problem returns
Check to see that none of you manual buttons are sticking or stuck, especially INPUT !
If none are stuck and your set is still under warranty please return it.
If not under warranty I would suggest taking to a local service center that is familiar with Insignia.
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