Canon powershot a590 IS lcd screen

I had this same problem. Once I got over about 1200 pictures, the screen just turned black, and the only setting that would work where I could see the lcd screen was the easy setting. I had read somewhere that this was due to the amount of pictures the camera had "counted", even if those pictures had been downloaded and erased from the camera. So I decided to reset the camera. Go to the tools list in the menu, scroll down to "reset all", and when it prompts if you want to "reset settings to default" click ok. This worked for me, and all of my settings - sunset, landscape, etc. - parameters in any of the settings (shutter speed, lighting, etc.) those will have to be reset.