Sorry if this topic doesn't fit this specific forum, but I'm in a rush and couldn't a find one that really pertains to this topic. My step-brother received all the parts for his new computer today and began putting it together the instant they arrived. His system specs are: -4 sticks of 2gb corsair ram -Nvidia GeForce GTX 280 -1tb HD -MSI p45 platinum mobo -Intel quad core 3.0 Ghz -850w Raidmax PSU The problem: After spending roughly an hour putting everything in and making sure everything was plugged in to the right slots, we finally closed the case in preparation to turn it on. The computer turned on, the fans were running, monitor lit up, motherboard screen shows up, ubuntu setup loads, we choose english, and then...it shuts off. Not formally, or slowly; it just completely shuts off. We've tried switching the outlet, making sure once again that everything is plugged in, taking out some of the RAM, taking out and inspecting the PSU, and still nothing. We made sure before we even bought the parts that his PSU could support everything, so I don't think that's the problem. If anyone could shed some light on this, it would be a great help.