How to fix my Nikon D300S?

I have turned on my Nikon D300S and the body lense is really blurry. I literally can't see anything past the lense except the colour of the thing i'm pointing at. However, when I connect an actual lense, it works perfectly and clearly.

What is the problem with the body? Whenever i look through the eye hole thingy (without the lense), all I see is blur. But when I connect the lense, it is fine.

Would this be covered under the warranty, let me know.

If you are just looking through the viewfinder on body of the camera, of course you won't see anything. Lenses are used for focusing and "zooming". Without the lens, the body of the camera is useless. Just for clarification, a lens is the piece that you ATTACH to the actual body of the camera, there's no lens already on the camera. What you need to do to see clearly is ATTACH A LENS! And no, there's no refunds because you obviously need to have a lens to focus and see.

Also, this is a very expensive camera to own if you don't know how to handle it properly. I suggest you do a lot of research.

Intelligent but uninformed people buying high end APS-C cameras without knowing some of the basics of photography is NOT a reason to return a camera.

Not knowing that the lens is the only way you can get light to focus on the sensor, producing sharp images show that you should at least take on class in photography to learn the fundamentals of photography and how to use a fully adjustable camera

Body lens = viewfinder

There's a diopter adjustment knob around it. Set camera to AF on then point to something about 10 feet away and press the shutter release button halfway to autofocus. While looking at the subject through the viewfinder, adjust diopter so that what you see is crisp and clear. It would be best to do this outdoors under the sun pointing to something brightly colored.

You ask such a silly question and claim to own a D300S?

All DSLR"s are blurry without a lens-silly. The lens is what focus's the image and made sharp by preesing the shutter button half way down "before" the shutter fires, until the subject comes into focus. Incidently there's no such thing as a "body lens". Have you botherd to adjust the rear viewfinder eyepiece to YOUR eyesight? Sounds like (lucky you!) there's no problem with the camera but the person operating it has not taken the time or made the effort to read and completey understand the instrution manual.

What's a "body lens"?
You need to attach a lens to the camera in order for it to work.