Aha. That should be why the user already found working RAM of his/her type.This laptop belongs in the trash and you should not spend one penny upgrading it. A Sempron laptop CPU was underpowered even when it launched, and struggled to run Windows XP. You have zero chance of a useful windows 7 or 10 experience. It will take 20 minutes to boot and 5 minutes to load each application, even with an SSD.
Finding DDR2 laptop ram that still works will be a pain, and the screen will be painfully low resolution, and your graphics chipset will be barely supported in any applications.