Hi, I'm Carl and welcome to Just Answer.
What was the last thing that happened before the black screen started to occur?
Was it dropped at all?
Do you hear any sounds when you press the Power Button?
Did you try using new AA Batteries?
Thank you for the clarification. That definitely helps! The problem is in the Shutter if the screen is black in both the View Finder and Screen. Look at the shutter while trying to take a picture. Is it opening then shutting or staying shut?