Les extended, screen remains black

When the battery is fully charged, please put it in again. That means, if it is still in, remove it once again.
Switch it on, and even if you don't see a thing try to make a picture.
Then press the display button several times, to see if anything comes on the screen again.
If the camera does not respond after that, you should go back to the dealer, of contact Nikon.

This is Battery Issue, Charge the battery fully.

Also Wipe the contacts on the Battery and inside the Camera battery slot

It should work fine

Regards,
Suhail

Look for DISP or DISPLAY button in the lower-right corner of the back of your camera. Press this once while the camera is turned on. The DISPLAY button manually turns the screen on and off. This is to save battery power for extended use. You would then use the optical viewfinder in its place.

Lens errors are fairly common. Usually it's sand or grit interfering with the lens extension mechanism. Or the camera's been dropped with the lens extended. Or the camera has been powered on, but the lens had been blocked preventing its extension. Or the battery ran down with the lens extended ... Unfortunately, many cameras that fall prey to this can only be corrected by professional repair. But, here are some things that you can do that may correct it. They only seem to work for less than 40% of the lens errors, but if the camera is out of warranty, they're worth a try.

this is most likely the sustainer board(s) problem. Replacing the sustainer boards should correct this problem for you. you can get the parts at vancebaldwin.com

This is a very common issue with digital camera on either the lens gears have to be replaced or the lens barrel need replacing. I rebuild these lenses all the time for 75.00 plus shipping and the turn around is normally less then a week. if you still need help fell free to contact me at [email protected]

Ditto... except my daughter is 10. Both screens remain black, are fully charged and green light stays on for more than 4 minutes.

There is usually a button for turning the screen on and off, or only on for previewing (browsing images). (and sometimes there is an option for having the screen on without the On-Screen Display)

I don't know exactly which one on your camera... sometimes the up button, sometimes there is a little symbol.

Play with it, and eventually you'll find the right button. =-]

Think it might be your batteries. 700mah batteries are pretty weak by today's standards (most are at least 2,500 mah these days). I'm guessing your batteries are several years old? If so, they're really only meant to have a usable shelf life of a few years, whether they are used or not. Recommend trying a new set of rechargeable batteries.

Sounds like you might have accidentally turned the display off. Turn on the camera and press the DISP button once on the back of your camera.