I recently upgraded my laptop from 4gb to 8gb by adding a sodium 1600mhz 1.5v ram to one of the slots. After rebooting and checking bios and task manager, the ram I installed isn't detected at all. I am sure that my ram is installed properly. My system came with windows 8.1 and I upgraded it to windows 10. My laptop model is Asus X552LAV-BBI5N08.