Crucial and MrMemory both offer 2x 4Gb Ram upgrades for my All in One Medion desktop PC.
If I take out the 2 x 2Gb origiinal RAM and install the 2 x 4Gb RAM I get the blue screen. If I install 1 x 4Gb chip I get the blue screen. If I reinstall the 2 x 2Gb Ram everything works again.
I am running Windows 7 Home Premium 64-bit system.
I have queried Medion and received a reply saying that the maximum RAM is 4Gb.