I have purchased a Nikon D3000, and everytime i want to take a photo in the dark,an manual mode, it tells me that the "subject is too dark". I have elaveted the ISO sensitivity, but even that still failed!! Can anyone tell me ho to fix this problem??? I own a Canon 1000D and i can use that in the pitch black dark, so why can't i use the Nikon in the pitch black dark??? Its like it needs a street light for it to work. I can't even take photos of the stars!!! Please Helpm Me if anyone knows!!!

Likely the auto-focus

Presumably it is because it cannot auto-focus, or cannot motify the settings to get an acceptable exposure. I have the d90, and set to AF-S (sometimes via AF-A), it will tell me the same thing (actually, it'll just refuse to fire). This is perfectly understandable, as it prevents you from taking out-of-focus pictures. If you set your autofocus mode to AF-C, this might go away. Certainly if you set it to manual focus, you should be allowed to take a picture regardless.

Error or Warning?

Is it an error as in it does not allow you to take the picture -- or simply a warning but you can still take the shot?

Is AF-assist Illuminator turned ON in the Shooting Menu?

If you are in Manual mode, use a slower shutter speed, larger aperture, in addition to higher ISO. Use the Exposure Indicator in the viewfinder to get an indication of shutter speed and aperture for correct exposure.

Still getting the warning? Pop up the flash and see if the warning disappears. If it does not, there's something wrong with the camera.

I had no problem using the Nikon D3000 in low light situations: http://www.photoxels.com/nikon-d3000-image-quality.html

I had this problem at first as well. You must turn the auto focus OFF in order to make exposures in the fashion you are describing. The issue is that this entry level DSLR tries very hard not to let you take an out of focus exposure.

I was taking pictures of the stars the other night (for the first time with the D3000). In order for the shutter release to function I had to turn AF off and focus manually. It was difficult to do this in an individual star itself so I focused on the moon, then framed Orion.