I was adding in two additional hard drives for dual boot purposes. Once I wired everything I turned on the computer with the case open to see if anything would happen. When it turned on I heard a popping noise and saw, with my own eyes, smoke come from the Motherboard. I'm not sure if the mobo or the PSU should get replaced. I can actually still turn the computer on. All LED's will shine and fans will spin. I cannot get any display to my monitor though.