Pretorian1

Your motherboard XFX geforce 8200 can support 4 different speeds of DDR2 RAM 533/667/800/1066. Elixir branded RAM isnt the greatest in the world and i have seen many of their modules not working properly in the past. Try checking your bios settings to make sure theres nothing there that needs to be adjusted to support the 800Mhz speed as the module currently in there is 667Mhz. I would recommend trying another stick of RAM, i usually go with Computer Memory upgrade,Laptop Memory,PC Memory RAM DDR DDR2 Memory these guys have great delivery and support and are a local british company.