Fayej1234 wrote:
I have a nikon D50 and when i plug it in to the usb the camera display says it is connected with the computer, but no notification shows on my computer screen and there is no way to download or view my pictures. Is there any software i can download so i can transfer my photos?
OK, let's back up a step and ask the following question: What does System Profiler tell you when you connect the camera and turn it on? Connect the camera and turn it on, then launch System Profiler from the Utilities folder (fastest way is while in the finder, do cmd-shift-U). By clicking the USB item under Hardware, you should see all USB devices that the computer sees. You can then click the item in the USB Device Tree that has the camera listed to get full information. If you do not see the camera listed, then you have a problem in either the camera, the USB cable or the computer. The USB cable is the most likely suspect. (See the example of a Tiger System Profiler listing below with a D11 connected and set to PTP mode.)
If you do see the camera in System Profiler, then there is a software issue we need to wring out.
If you haven't downloaded Nikon ViewNX 2, you probably should. It needs Leopard, which you indicate you have, so you shouldn't have a problem with the latest version.

BTW, I mentioned earlier that the D100 was USB 1 only, which is confirmed by the speed listing in SP.