Why is my Nikon d.50. displaying a type of menu on the monitor , when i preview last photo taken,hothing in ma

Answer 1

It's probably displaying exif information or a histogram on top of the image. With my D200 (probably the same with the D50) I can hide that extra information by pressing 'up' on the joypad. In the menu settings, I can also tell the camera exactly what information screens to display (if any).