Hi folks. I was working on my mom-in-laws Dell Dimenwsion 2400 (which I rebuilt a few times already) but can't remember....is PCI the same as PCI Express? Were going to get her a new CD drive tomorrow (she doesn't need "write" capability). The one she has now fails to communicate. Motherboard sees it, just no response from drawer open or read capabilities. It's 33mhz! YEAH, I know, it's old. But at 77, she doesn't need all the "bells and whistles"!!