I bought a Compaq CQ58 laptop for my daughter for Christmas. It has 2GB of RAM. I have purchased a compatible 4GB RAM stick to upgrade her memory. I have also watched a YouTube tutorial on how to put it in.
My question is, do I have to remove the 2GB that her laptop already has or can I use it along with the new one? The tutorial shows the man removing his old memory and replacing it with two new 4GB memory cards. The laptop is less than 2 months old.