I have nikon d80 the lens makes a funny noise and won't focus for a picture

try another lens.

Turn the aperture ring to its smallest setting (largest f/number). You control the aperture from the camera body, as on a lens without an aperture ring. Turn the mode dial to M (manual). The camera's exposure meter will not work with this lens. You can use another lens to get an approximate exposure, or take pictures and review them and/or use the histogram to fine-tune the exposure. The camera won't autofocus, of course, but the in-focus indicator in the viewfinder will still light up to indicate proper focus.

maybe the motor focus is broken, i ever have the same problem before autofocus motor totally dead..

The r11 is in the lower right of the top LCD or view finder that is in the D80 manual page 36 it speaks about the buffer. The r with a number is how many shots the buffer at that moment can handle. It is not an error message. For auto focus issue is the lens in AF as well as the camera?

Please read page 36 in the D80 manual. What you are looking for is just down from the top, "Continous".

AF lenses normally have a subtle grinding noise when used. Make sure your AF switch is turned on. If this still does not work, you may wanna consider bringing it in for repair

Press the AF button on the top of the camera (to the right of the window) to select an AF mode & make sure the M/A (Manual / Auto focus) switch on the lens set to "A"

More info below:

http://www.kenrockwell.com/nikon/d80/af-settings.htm

Make sure your AF-switch on your camera and your lens are both turned on.

http://forums.dpreview.com/forums/read.asp?forum=1030&message=29592825

EXPLANATION.
1. The problem with 18-135 lens is because it make from plastic. Main problem from plastic is it can be reshaped after a few usage. When the shape ran out, the contact point will be defective. When the contact point didnt really touched, the processor cant send signal to lens to do autofocus (the lens focus using the lens motor, not the body). When u set to manual focus, the body doesnt need to instruct the lens to focus.
2. You are focusing something that is to near than the focal point.

SOLUTION.
1.Try cleaning the contact point on the lens. Then mount it back until the F showing up (F= aperture). This solution depend on your luck too. if the gap between to contact is so far, then it might happen back. Usually when u need it badly. haha
2. try to get more distance from your subject. Just keep press the shutter until the camera focus.

CONCLUSION
1.But new lens with metal mounting. It will last and durable.
2.Buy macro lens to close up. normal lens wont focus at short focal point!!~