Hi, sorry for less info I gave. At Oliver's link if you scroll down a little you can see tab "Files" there are librarires, datasheet and etc.
I used u8lib library,LCD12864R,and that from hobbyking. I have connected it in serial mode and tried and connected it in parallel mode and tried. I didn't mismatched wires because as you see in pic I gave there is connector at board for serial or parallel , same connector I have on sensor shield so I think it can't be wrong if I connect board with lcd over these connector. At lcd board I have knob for contrast already built in.
I went this way. Install arduino software and setuped it for mega2560. I did blinky example for see does it work and work.. then I have connected it in serial mode with lcd module and used example from arduino software "hello world", it didn't work so I put u8lib and did retry and same and I did with lib from hobbyking site and same problem. LCD flashes because of delay in code probably but no text.
Am I forgot something else to tell? to get you all info? tell me if I can help you to help me