I know you guys get this question all the time, but I'm just confused right now. And yes I read the sticky. Details- Motherboard: http://www.msicomputer.com/product/p_spec.asp?model=648_Max-L&class=mb Current Ram: http://www.geeks.com/details.asp?invtid=CMX512-3200C2-DT&cat=RAM New Ram: http://www.zipzoomfly.com/jsp/ProductDetail.jsp?ProductCode=80098-6 Here's what's wrong. I've had this computer for quite some time now, so I decided it was time to increase my ram from 512MB to 1GB. Now, when I added the new stick of ram into the mobo and booted the computer, I received no bios beeps and there was no monitor display. My first thought was that I bought the wrong kind of ram. However, when I took out my old stick and put in the new one by itself, my computer runs fine with no problems. So now I'm guessing there's some kind of conflict between the two sticks. My question is: why? Albeit they aren't the exact same, but I figured the differences between the XMS and VS wouldn't be a problem. Also, all of the drivers for my motherboard are up-to-date, and I flashed the bios with the most recent version. I'm not overclocking either. Anyone have any ideas? Are they just not compatible for some reason? Or did I mess up and buy the wrong kind of ram? Or is it something else? Thanks for any help.