I am having the same problem i had with my older computer before i got frustrated and blow out the north bridge lol. My computer is turning on for 1 second the longest and shutting down immediately. I have a 1000w PSU with asus p6x58d premium, they are both new and came today.. i have been building it most of the day to get it right. I have 1 of those power wires that come with 4x4 female molex connectors and each is plugged into a 120mm fan plus 2x80mm fans, 6 fans in total for 4 molex power connectors in one cord. Is this my problem ? Should i take off 3 fans and add another modular molex cord that brings 4 more molexs ? I believe its a power shortage some where. I am frustrated man plz help.