Friend of mine gave me a Dell XPS 8900 because it wouldn't boot, fans turned on nothing happened after. Did some poking around and figured out it was the RAM. Took all the ram sticks out and tested each, they all work, now if I try and stick these RAM sticks in Dual Channel, well nothing happens, put the ram sticks in single channel everything boots just fine. So what I'm trying to figure out is why the computer won't post when it's dual channel. This is the original RAM too. Any thoughts or ideas? Thanks!