I have a dx2200 HP and it only shows 850 MB of RAM with a 1 GB stick installed. I tried to add another 1 GB stick just like the other 10 dx2200 we have, but it doesn’t detect the extra RAM. In fact the computer doesn’t even boot. I tried switching the sticks around and even using 512 in each slot and it works fine, so it isn’t the slots or ram that’s bad. Does anyone have any suggestions why this it happening?