My G12 will take pictures on auto setting using the viewfinder, but the display is dark. Not totally dark; there is a faint glow which goes when I switch off the display. I've opened the back and cleaned the ribbon connector. The flexible wire connection looks ok. Any ideas what might be the problem?
Your issue may be easily fixed. My guess is you did what I did, and inadvertently pushed the DISP. (display) button next to the MENU button on the lower righthand corner on the back of the camera. The DISP. button toggles between 3 views: black/blank screen (to save charge/battery life), regular view, and a display with a handy level and rule of thirds guidelines. Hope this helps.
There is an option to turn the display off when taking pictures. It conserves the battery. I cannot remember if the setting is in the menu or it can be changed by pushing one of the other buttons on the camera. If the display works properly when you are reviewing the pictures that you have already taken then the above is the problem. If the display is also dark when you are reviewing pictures then you have a camera problem.