ram slot not working ddr3 - How to find and fix bad RAM in MacBook? - Soldrit armada 888 slot

To avoid any RAM issues, ensure not to skip the first RAM slot if you have multiple slots.

Asus Zenbook Touch UX31A questions - How do I add more RAM - sd card slot problem - UX360ca Touchpad Not Working - Power connector internal pin broken - Anyway to repair charging port?

You cannot put DDR3 in a DDR4 RAM slot, so if you are buying a newer processor, such as an eighth or ninth generation Intel, or an AMD Ryzen processor, you will need to purchase DDR4 RAM to go with it.