2 things to check before you buy RAM. First, open the cover on the bottom of the laptop so you can see how many slots are there, and how many sticks of RAM are there. If you have 2 slots AND 2 sticks, you will need to remove the smaller stick(you likely have a 2GB stick and a 1GB stick, so you would remove the 1GB stick and replace with another 2GB stick that is an exact match of the original). You might also consider removing BOTH sticks and dropping in a pair of 4GB sticks for a total of 8GB(recommended if you have Windows 7 or 8 64 bit)
