I have a toshiba l675d-s7101 it comes with two 2gb sticks of ram. It can be upgraded up to 8gb of ram so I recently bought a 4gb stick of crucial ram so I would have 6gb. The 2gb stick is samsung brand the 4gb is crucial. When I plugged the 4gb in my computer only recognizes the 2gb. It says my computer takes ddr3 pc3-106000 which is what both sticks are. Am I doing something wrong installing ?