OK - I have read a lot of threads - however - I have spent hours troubleshooting this - and I have it down to this - my SATA hard drive is causing my power supply to shutdown after about 4 - 5 seconds of booting up. My original power supply was a Antec 650 - and the machine ran for 2 months - the other day - bam - it powered off - so I tried several different things - finally got another power supply a Shark 585 - hooked everything up - and powers up for 5 seconds then shuts down - started hooking things up one thing at a time - finally got the power to stay on by leaving the SATA hard drive unplugged. I don't have that much stuff in the system - a PCIE video card - and hard dirve - no extra drives - nothing - I inspected the board on the hard drive - I don't see any fried components - this drive is only 2 months old - and it's a Maxtor - is my brand new SATA hard drive really fried??? Does anyone have knowledge of this happening before. Thanks in advance!!!