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Restart your device: Sometimes, a simple restart can solve minor issues. If your power button is unresponsive, try restarting your phone to see if it resolves the problem.

Check for physical damage: Inspect the power button for any physical damage. If the button is physically damaged, it may need to be repaired or replaced. Contact Samsung customer support or visit an authorized service center for assistance.

Use alternative methods to lock/unlock the screen: If the power button isn't working, you can use alternative methods to lock and unlock your screen. Go to Settings > Display > Navigation bar and choose "Swipe gestures" or "Navigation buttons" to enable on-screen navigation options.

Enable AssistiveTouch (if available): Some Android devices have accessibility features that allow you to control certain functions, including the power button, through on-screen gestures. Check if your Samsung Galaxy A12 has a feature like AssistiveTouch and enable it if available.

Update your device: Ensure that device's software is up-to-date. Software updates can include bug fixes and improvements that might address issues with the power button. Go to Settings > Software update > Download and install to check for updates.

Factory reset (as a last resort): If all else fails and the power button is still unresponsive, you may consider performing a factory reset. Keep in mind that this will erase all data on your device, so make sure to back up your important data before proceeding. To factory reset, go to Settings > General management > Reset > Factory data reset