I recently bought 3 1gb sticks of ram. However, the slots in my computer are in different colors, it's black blue black blue. My computer only works if 2 blacks or 2 blues are used, it can't be 2 blacks 1 blue or 2 blues 1 black. Is there a reason for this? I can only use 2 sticks, in slots that are the same color or my computer makes that long beeping noise. Is there a solution?