Hi all! My husband and I have identical machines. I've been having no problems, but he has has memory related issues. World of Warcraft was not installing properly and it was also crashing a lot. After looking up similar problems online, we narrowed it down to memory issues, and indeed, that's what it is. With ONE stick in, the game installed without a problem. With ONE stick in, WoW works great without crashing. Putting both sticks in causes crashes. Anyway, the sticks are identical, at least as they LOOK on the outside. What is printed on one is printed on the other, and that is: DDR2 800(5) 2GX16. It doesn't matter what slot he puts each in or which stick he puts in, if it's by itself it works. If they are both in, it doesn't work. So, any clue as to what to do? We don't want to order more RAM because it doesn't seem like either stick is bad... they just don't work together. Looking up solutions online only helps as far as trying to get two sticks that don't quite match to work, but these are identical. Any help would be greatly appreciated! Thank you!