Page 109 of the manual lists possible causes such as battery chamber not latched, batteries not in right orientation, AC power adapter not properly connected, or after having batteries out and camera left unplugged for a long time and then plugging it in, you have not waited for a few minutes before turning it on. If the LCD screen will not come on, there is the possibility it is bad. If attention to these matters is unsuccessful, there well may be a hardware problem requiring a repair shop.
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Page 109 of the manual lists possible causes such as battery chamber not latched, batteries not in right orientation, AC power adapter not properly connected, or after having batteries out and camera left unplugged for a long time and then plugging it in, you have not waited for a few minutes before turning it on. If the LCD screen will not come on, there is the possibility it is bad. If attention to these matters is unsuccessful, there well may be a hardware problem requiring a repair shop.