The access light on my camera stays on.

The access light on my camera stays on.

I bought my camera in 2011. It's a Sony A33 Digital camera. I just love it. But now the red access light will not turn off and the camera will not turn on. I have searched the internet for answers. So far I have tried multiple SD cards and two fully charged batteries. Nothing seems to work. What I have read is that a motherboard might be the issue. What are your thoughts?