Ok, So about a week ago I came home and my computer had shut itself off. The lights on the motherboard were still on. I would press the power button and nothing would happen. I turned off my power supply and all the lights went out, and then switched it back on. The lights on the motherboard came back on and when I press the main power button the case fan would twitch like a 16th of a rotation only the first time I pressed the button. The case fan is connected directly to the power supply. There was no other reaction. I replaced the power supply and nothing changed. The system is under a year old, ASRock P55Extream with an i5 processor. Any ideas?