I have, that rainbow is an accurate representation of what all my photos look like color range wize. I have done multiple shoots in good light and auto white balance.
In that case, can you post a sample image?
There seems to be a lot of noise for ISO 400, plus nothing seems sharp.
Your settings seem to be all over the place - manual exposure for one, flash off for another, user Picture Styles, and what seem to be less than ideal shooting conditions.
Is image 2 Portland Jetport?
I would suggest 1. reset the camera again, 2. format the card (or even try a new card), 3. set the camera to Auto and 4. take a photo outdoors in good light.