I have a ddr3 motherboard with 8gb of ram. I've tried to add another 8gb of ram today to make it to 16gb from 2 sticks of 4gb but i have an issue where both of these sticks will not work on my PC. I used my previous slots from my old RAM for the new ram i have and it still wouldn't work. As long as the new ram is in my pc, the DRAM red light will be flashing and I will not be able to get a signal on my monitor? Id appreciate help on this