You may just have a battery that need replacing (recharging).
You may have inadvertently set something that is causing the condition.
Reset the Camera.
Look in the back of the User Manual at the Index.
Look for "Reset All"
"Reset All" will reset the camera to factory settings.
My wife has a Canon Power Shot A530, about 3 years old. After you take a photo, you get to see that image for 2 seconds. Problem is, that 2 seconds if followed by the screen going totally blank for about 5 seconds.
I tried turning off that image preview, but the screen still goes blank after each photo. This is frustrating when trying to take quick snapshots.