>I've got a Dell d520. It has 2gb (2 chips) and I'm replacing it with 4gb (2 chips). Problem is I can only find one of the modules. The system says I have 1.99gb, and the module I can find is a 1gb, so I know there is another one there somewhere. I think it's underneath the one I can see, but I can't find a way to get to it. I don't want to force anything. This is the link with the tech information: http://support.dell.com/support/edocs/systems/latd520/en/sm_en/memory.htm#wp999869 Not as helpful as it could be. I'm holding off calling Dell because that is usually a couple hours of hell.

The way I read it, there is one memory module on the "top" of the mobo (DIMM A), and one on the "bottom" (DIMM B).

You get at DIMM A from the top of the computer, by removing the keyboard as they explain.

You get at DIMM B from the bottom of the computer, by removing a cover from the bottom of your laptop (usually a relatively small one, often held on by a single screw).

Looking more thoroughly at your link, the instructions look fairly clear.