Subtitle: “Whoa, I just reprogrammed a RAM chip”
I purchased 4 GiB of RAM for my sister and brother-in-law’s old Macbook. Did you know that Apple shipped a Macbook configuration in 2008 that included only 1 GiB of RAM? Since I upgraded them to Snow Leopard (64-bit!) and they want to use vmware Fusion to run Windows 7 side-by-side, they sorely needed some more memory.
I bought two of these RAM modules for their computer and had them shipped to my parent’s address, so that they were available when I came home for the long weekend. I put both of the RAM modules in, and was dismayed by what happened when I tried to start up; instead of the gray-on-grey Apple startup screen, I got no chime and a solid white light from the power/sleep indicator. I took one of the modules out and put an old 512 MiB modules back in, and it started up and showed 2.5 GB of memory installed.