Hmmm. I don't know how you could have over-exposed the image with the gain at its lowest setting?
That would have given you a black screen
Are you sure the gain slider was all the way to the left? It looks like you cranked it all the way to the right, which is max setting.
Make sure your brightness slider is about in the middle, exposure (shutter) at 1/25 or 1/33, gain about 50-60% and saturation maxed.
Leave the gamma slider almost all the way to the left.
That should get you a better result
