Ok so I built this puppy two years ago using the ASUS M5A97 r2.0 MB, an AMD Phenom II X4 945 3.0 Ghz CPU, EVGA Getforce 8400 video card and 16GB of Corsair XMS3 8GB DDR3 PC10666 1333MHz RAM. Recently, I wanted to pump this thing up with another 16 GB of Ram so I purchased 2 sticks of Patriot Signature Line 16GB DDR3, 1333 MHz, DIMM, PC3-10600. After installing the new RAM, I had no video, and I had to manually do a cold boot to shut down the computer. Everything else was ok, including the RAM test lamp on the MB. I switched the video card from one PCI slot to the other and it came up one time and then back to no video. By the way, the power supply is 750 W. I've flashed the BIOS and still no change. Can anyone point me in the right direction?