A few months ago I finished this build finally, and now it's showing some problems. I've had more than a month to figure the problem and I still can't put my finger on it. I have an idea which I hope is correct. Lately the PC has been shutting off unexpectedly. It's as though the power has been unplugged or the switch has been flipped to off, just instant power loss. I've already replaced the PSU once. The original was a Thermaltake and the replacement is a Thermaltake. I thought "well if it is the PSU, I don't think that I would get another faulty part." and well when I got the replacement, signs of the same problem was showing again. Now I'm looking forward to getting a Corsair 620W PSU. If anyone has any other idea as to what it is, please tell me. thank you in advance.