See I have 2 sticks of ram one is 8gigs(the old one) my new one if im correct is 12 gigs. In my BIOS it shows both ram are working and have sufficient power but if I take out the old ram my computer will no longer boot it will turn on and sit there (It dosent boot at all I cant access the bios). And when I use CPU-Z it only shows up with 1 stick in the memory tab and its the 8 gigs.