What is the meaning of this massage on anikon d100 camera "E r r".( this usually happens when switch on my nikon d100 camera and when i try to shoot it dosent and the "E r r" massage persists.please i urgently need your help)

change the batteries

Why would you want to do this?....connect a computer to your camera and lug it around just so you can shoot live view pictures?

You have two error messagess. !. the r06 message is an estimate of how many remaining pictures the memory card can hold and 2. ERR-is usually a camera malfunction. turn off camera remove and replace the battery. If that does not do it, then if your camera has a reset switch(should tell you in owners manual--My Nikon D70 does), try that. If that does not fix the issue, the camera should be looked at by an authorized Nikon tech.

are you shooting in raw format? and in hi resolution or low resolution ? If you are shooting in RAW then the buffer of the d100 is full and it needs to empty its buffer before you can shoot anymore pictures

The Nikon D100 custom settings option 22 - AF Assist, controls the AF Assist light.
Check if this has been turned off.

This option controls whether the auto-focus assist light comes on in low light to help autofocus
latch onto the subject.

The D100 does not have a Live View capability. The screen can be used for menus and image reviews, not previews.

Have you tried to reset the camera? I seen this a few times .. and the camera reset did the trick. I've never heard of the motor noise though.

I had similar problem with D80 try removing the lens and cleaning the contacts. that seemd to work well for me.

When you say you tried full manual, I just wanted to check that you also switched to manual focus? The D100 has a switch on the right side of the lens, says M, S, C, for manual, single, or continuous focus? You need that in M with a painting like that, or to should truly diffuse subjects like clouds or fog.

The reason it works fine with only part of the painting in frame is that the camera can then identify and focus on the edge of the painting. It could also focus on any painting with linear or sharp detail. Autofocus is rather clever, but not clever enough!

If you had indeed set manual focus, then I admit I'm stumped. Full manual mode with manual focus never refuses to trigger the shutter on my D70; although it does often take pictures I don't understand at first. :) Good luck -- let us know what you find out, please!

Mine too. It's a worn-out selector switch. Jiggle it and it'll work again. Time delay same. Our college has four Nikon D100s with this problem. Poor switch contacts.