Hey guys! Here is the deal... ..A short time ago I upgraded from XP to Vista and with the kind help of a friend upgraded bits and bobs parts-wise inside my machine as its slightly out of date. Anyway, I purchased a 512MB of RAM from CEX about 1-2 months ago to add to my 256MB of RAM but there is where my problem lays... It will not pick up both of them, only the 256MB if they are both inserted, but the 512MB on its own with be fine but I would like both working at the same time. Here is the full spec of the 256 (which is written on the RAM) for those of higher knowledge.. ELIXIR M1U25664DS88C3G-5T 256MB DDR-400MHz - CL3 PC3200U - 30330 I am unsure of the 512MB as it is being used at the moment but I am pretty sure it is DDR, PC3200 Any help would be gratefully recieved.