I bought two 1GB PC3200 samsung memory sticks for my PC and my PC originally comes with 512mb PC2700. I have read the maual so the samsung memory is compatible with the PC. Also, i read that u can mix PC2700 and PC3200 together but it will run at slowest speed. So, I just added the memory to dimm3 and dimm 4 slots and when i turned the computer on it start to make a beeping sound and it wouldn't do anything else. Then, I tried it without the original memory it still didn't work. THere a 4 dimm slots on the motherboard and the max it can support is 4gb. SO, anyone has an idea whats wrong. I currently have two 256mb PC2700 installed and they work with the original memory combined. But, the two 1GB ones wont work.