Good, I recently bought a pc, which came with 4 of ram and I wanted to increase it to 16 with 1 ram of 8 and another of 4, the pc has 4 stocks of rams, the problem is that when I place the other two rams that I want to not give video and after a while the fan the PC starts to sound hard, what I have to do for the PC to read the rams is to turn on the PC with the 4 of rams and turn it off and place the other rams to work with 16, sometimes grab and sometimes not, the pc is i5 2400, dr3 just like all the rams, I have to restart and take out and put the rams several times for the pc to work, I would like to know why this happens and if I could fix it because it is very annoying that every time you turn on the PC you have to do all that procedure to remove and insert the rams

Try the memories one by one, maybe one of them is incompatible.