Bugger it! currently running 2 slots of DDR pc2300 (256Mb) of RAM in my Sony VIO. Checked for compatible RAM today and bought two lumps of DDR pc2700 (512Mb) which is suppossed to be compatible. Swapped it over and got the blue screen of death and total failure to boot after that. Questions did I miss something and if so what? Any help would be greatly appreciated guys. Cheers.