Nikon d3000 picture on camera is flashing black in parts of screen

SOURCE: LCD Screen

to turn this setting off just press the down arrow button when reviewing your photos. you will scroll through a number of ways to view tho photo including histogram, and one of the settings is just the picture.

SOURCE: MY NIKON D50 SCREEN HAS

This screen shows areas of the photo that are overexposed slightly.
It flashes them to help you.
You get to this screen by pressing the up or down arrows when displaying the pictures you have taken.

To change it just press the up arrow when the camera is showing the screen until you get a display without flashing.

Once you have done this the display will be steady.
If you get any other screen in future you may have accidently pressed the arrow again.
Just cycle thru the displays to get back to steady.

SOURCE: how to remove the battery from nikon d3000

the little trap door on the bottom houses both the memory card and the battery. you have to push the battery slightly to release it. i fond the easiest way at that point is to tip the camera and the battery usually slides right out.

SOURCE: Nikon D3000 Monitor is black when taking a picture

You can get the shooting information on it. If you're looking to use the D3000 as a point&shoot by viewing the image on the screen, then no, you have to use the viewfinder.

SOURCE: Dropped camera. Now screen is part picture, part

maybe your lcd screen is broken.
you could try to buy a replacement and fix up it yourself.
from belwo you will find it.
http://szaideal.diytrade.com/sdp/975724/4/pl-4820089/0/Product_Catalog.html