Aright i have a msi kt3 ultra 2 mother board that i run xp home edition on. And this mobo has 3 sdddr ram slots. Which hold up to a max of 3gigs. And i had 2 512 sticks of ddr ram in it. A couple months ago i bought another 512 stick of ram and installed it and my computer completley ****ed up. It was running even slower thain my old windows 95 did. so i took out one of my old sticks of ram and replaced it with the new one and it ran fine. Well today i decided that i wanted to **** with it again and put the other stick in there. well now my comp wont even start windows. so i took it back out and its still doin the same ****. this screen comes up telling me that windows wont start and says that it will start in 30 sec. after that it does the usual loding screen with the xp logo. but then the screen just goes blank. i really need some help. any help is appreciated. thanks in advance. *edit* also my power supply has 115/230 volts. when i run it on 115 its fine but when i run it on 230 my moniter wont respond. i have a acer 19" widescreen moniter.