Lcd to mini rambo not working

I connected my large screen to mini rambo. I hear a click and there is a very faint flash of light coming from the screen. I reversed the cables and nothing happens. I want to test the motors for correct direction. I took precautions on turning power off when reversing the lcd cables. Please help! Is it possible to test motors just using the lcd or do I have to connect to the computer for that?

You still have it plugged in wrong, look at the red stripe not the direction of the plugs.

Thank you Ryan for your quick response. I will do this when I get home. You are truly a savior.