Computer doesn't recognize Nikon D70?

Well, one day I connected my camera to the computer and it worked perfectly fine. But, the next day I've tried and nothing showed up. The camera s green light lights up but nothing happens.

What may wrong with the camera?

Nothing is wrong with your camera.

You just have to do what most of us have been doing for nearly two decades.

* Remove the memory card from the camera
* Insert it into your computers card reader or a USB card reader you purchased ($10 - $20)
* Using your computer skills, copy all the images from your memory card to a new file folder you have named for the subject/location and date so you can find them later
* Once you have all the image files safely on your computer, use the format feature on your D70 to prepare the memory card for the next time you go out shooting

Probably nothing wrong with your camera. Sometimes I have to plug my memory card in several times before the computer recognizes it. And occasionally I have to reboot the computer to get it to recognize my memory card. If your computer doesn't have a port for your memory card, buy a card reader. There will be less wear and tear on your camera.