Nikon D40 over & under Exposure problem? - 1

I have just bought a Nikon D40 and after playing with it for a while I realised there's a big problem with it. It overexposes and underexposes at the same time in the same picture. Just like when you would shoot high contrast photos. Compared with D90 looks just wrong.

Any help or advice?

Shoot manual. Find the correct settings for the look you want, switch over to manual, dial in the shutter speed, aperture and ISO, and all your photos will be correctly exposed. You just need to watch the light because if the lighting changes, you will need to adjust. A helpful resource is: http://www.learningcameras.com

Some cameras have a tendency to over/under expose and lenses can contribute to that as well.