Ok, we think we have solved the problem!!! We had run into this issues with my friends machine, and even with a new 850 power supply upgrade the issue appears to be with current Nvidia cards. Under CPUReview website they show the max wattage draw of each graphics chip. It looks like the Nvidia GTX 460 was pulling 160 watts and the next card we tried, the Nvidia GTX 470 was pulling 170 maximum watts. We tried and tried and couldn't get the system to work. Now, several months later, we gave it another try and used a Geforce 9700 GS PCI-E card and it worked just fine. The card wasn't fast enough, but it only had a max current draw of 82 watts. That got us to thinking it was the fact that the 9700 GS uses DDR3, and the newer Nvidia cards use DDR5, but after checking we found that had nothing to do with the problem. Next we dove into the voltage issue and grabbed a new ATI Radeon HD 5450 which also ran fine and had a maximum power draw of 20 watts. The card was underpowered for 3D graphics so we then jumped up to an ATI Radeon HD 6770 and again it worked just fine at 108 watts. Keep in mind we had returned all of our previous gear, but we did have a Thermaltake 500 watt PSU available so we had already put that in the machine as we thought the stock 300 watt PSU was a no-name, underpowered unit. So far he has played several games at high frame rates with no issues. Our final thought is that the Pegatron m2n78-la motherboard doesn't like the power draws of the newer Nvidia cards. Hopefully this helps you folks!! Wooohoo!! Ok, it's game time!!