I have the Nikon D40x, and I am really interested in bird photography, but my camera seems to have a problem....at least, I have a problem understanding it: I wanted to test out all the modes and settings, but whenever I use anything higher than 1/80s shutter speed, I get a black photo...the only thing I can take a picture of at anything higher is a lightbulb! The same thing happens when I set the aperture to high!(Note: I have only tested this inside, with no flash, because when I use flash the shutter speed only goes up to 1/200s, which works) Like I said, I am brand new to photography, and I'm probably doing something wrong. I really want to take pictures of humming birds, which are common here, but if I can't get the shutter speed (or aperture) to work right at a high setting, then they will just be a blur! All Help is greatly appreciated! Thanks in advance!