System randomly quits working

I just got my mobo back from an RMA at Asus, it's a M5A99FXPro R2.0. I had been trying to upgrade my CPU from an AMD 8150 to a FX8350, and the mobo refused to recognize the CPU, and would not let me flash the BIOS, no matter what I did I couldn't get a successful POST. So, I send it off, got it back last Friday, the chip installed fine, and everything seemed like it was going to be all unicorns farting rainbows from there on out. But not so fast, it had some surprises left for me. It started when I tried to play Battlefield 4, in the middle of playing, everything just stopped. The monitors flashed "No Signal" and the sound stopped, however the rig was still running, just not doing anything. I pushed the reset button, nothing happened. You have to turn the power off totally, then turn it back on, and it will boot back up just fine, like nothing happened. I was monitoring temps, nothing gets hot, I have a liquid CPU cooler and it stays under 30 C, even with a heavy load, and the GFX card never went above 70 C. Mobo temps around 35 C, so the thermal enviroment is good. A t first I thought it was something to do w/ the GFX card, so I ditched the beta drivers and went back to last official release, it still happened. I should mention nothing is OC'd right now, all is at stock speeds. I tried putting the GFX card in a different PCI-E slot, but when I try to start it up, I get a "No VGA" error during POST when I put it anywhere except the first slot. I then tried running Furmark to induce an event, however I was able to run the Extreme Burn-In test for 45 mins with no crash. GPU temps stayed under 75 C. A couple of days ago, the crash occured, and I saw a BSOD for a split second, however it wasn't visible long enough to tell what it said, and the was no dump file created. (yes, they are enabled) It doesn't create a DMP when this event occurs. So i decided to do a clean reload of Windows, this installation was a couple of years old. I did that, and then this morning it crashed while I was just browsing the internet, no gaming or stress at all. Same thing, everything just quit, No signal to display, had to power off and reboot.
I am at my wits end with this, I hate the idea of sending my mobo off again for a month, but I have no ideas left. Anyone that could help me solve this would truly be my hero.