Hi, I recently got my hands on 2 8gb sticks of ram, and I wanted to upgrade my ram since I had 4 sticks of 4gb. I tried replacing 2 of them with the 8gb, and my pc would turn on, but not startup. I removed all of my ram and it started up without the 2 4gb. But anytime I had the 4gb and 8gb plugged in at the same time, my pc would not start up. I had 2 hyperx 4gb and 2 8gb dell memory upgrades.