I have a laptop with 4gb of ram right now but I know for a fact that the mother board is able to handle up to 8gb's of ram. When I put the extra 4gb's of ram the laptop would turn on the fan will start operating but the screen remains black, when I tried both of the 4gb stick individually they work perfectly fine but when I put them together they do not work, it also seems as though only one of the 2 slots for the sticks work when I put one stick into the slot that I believe does not work the laptop experiences the same issue