Your latest post tells me that your on/off switch might be stuck in the O position past the On position, or you are inadvertently holding it there. If you can see the lens stop down through the finder, your camera is previewing the depth of field. Turn the camera off, then turn it on, but go only one click. Try again. If your shutter dial is not returning automatically to the On position when you take your finger off the on switch, repairs might be in order. I did not realize that your DA lenses were acting up as well.
I don't have Live View on my camera, so I do not know if you have a Live View switch that you turn on and leave on. If you do, turn it off. You can also try removing the batteries from the camera (with the power switch turned off) and leaving it for a while before putting the batteries back in and turning it on.
Last edited by Canada_Rockies; 09-24-2012 at 10:45 AM.