I got my PC a little over 2 years ago, a P3 450MHz, and I want to add 512M RAM to my current 256M, because I want to have a whole lot of RAM for the next few years. So I bought 512M (on a single chip) and installed it next to my two 128M chips, but my pc gave me errors when I turned it on. It said "memory loss" and something else, and told me to restart my pc. I removed one of my 128M chips, but got the same result. I removed the last 128M chip, with only the 512M left, and when I turned the pc on, the power came on, but my monitor was blank. I tried again, putting the 512M in a different slot, but the same thing happened. So I took it out and put the two 128M back in and everything is fine... but why can't I get the 512M to work? Why would my pc have a RAM limit lower than 512M? Or is it something else??