well it's been done, the eVGA 7800GTX graphix card, the 4GB ddr2 memory, the Asus P5ND2-SLI Mobo, the Pentium-D 840, the Audigy4 sound card, the 500W x-connect PSU and when it starts up either the just the chassis fan starts and nothing more or the the comp starts up and then totally dies. The 4-pin 12V mobo connection is unplugged and then plugged in, respectively for each scenario. What the heck do you guys think is wrong? When I first had it working, it had a biostar 945 series mobo and it worked ok, then one night in a drunken rage, I ripped out a 120gb hard drive that wasn't even attached (to put into another comp.) but needless to say I haven't gotten any results from just replacing the mobo. Maybe it's the PSU wires but I want to see other people think before buying something else.