This has happened to me and I have solved it. The best way to fit ram into your hc sxc gaming rig is to have ram sticks in pairs/duals with same memory size, brand and model. You would rather have 2*1gb ram sticks than 1*2gb coz that fks your pc up. If it is 2*1 it should be the same brand and model. You wouldn't put a G Skill 1 gb with a Kingston 1 gb. Even within brands there are many different models. They have to be the SAME model no matter what.