hello all this is my first post on this boards. would appricate any help i can get with this problem. ok i have bout some new ram from my comp its a 512meg stick 3200/400mhz the other 2 sticks in my computer are 256x 2 which both are also 3200/400mhz speed also. so i shut down and installed the 512 one i got today and when i boot up i get this black screen with the msg err see your computer documentation for system memory configuration. so i tried every possible combination i could and still nothing but when i take out the 2 256's ones and leave the 512 it runs fine on the comp vice versa when i take out the 512 and leave in the 256's. thx in advance for any help guys, very frustrateing situation was so lookin forward to 1gig of ram.