My emachines T1440 came with two sticks of 128mb and I am trying to upgrade to the max allowable - 518mb. I purchased two brand new sticks specified for the machine but not at the same time. When the first stick arrived, I installed it leaving one slot with an old stick. Then I found out that I had to have matching sticks in each slot. So I bought another stick. However, when installed along side the other 256mb, the machine freezes. I have checked out each stick separately to see if one is bad, but this is not the case as each works fine with the old 128mb in the other slot. I've contacted emachines for assistance but they blow me off . . . probably cause the pc is old. I was hoping that someone here could offer some suggestions . . . as you can tell I am not a guru but am willing to try.