Desktops forum: What is causing my desktop to crash??

Hey guys, I've Googled the hell out of this issue but to no obvious avail and so my last stop is here hoping someone out there knows more about this than I do.

Okay, so here's my problem during normal application use and folder surfing and once while Idling my desktop PC just shut off and rebooted itself. I'm not sure what's causing this because A) There's no BSOD, just a black screen then an immediate reboot. B). My system is not creating dump files or crash files. C). Nothing significant is logged in the event viewer at anytime around the crash.

It's a pretty fast process when it happens and the LED's on my cooling fans don't even shut off, for all intents and purposes it looks just like a regular system reboot.

This computer is bran new, I mean only about 3 weeks old with a fresh windows 7 professional installation.

I've checked for viruses, overheating, dust build-up, and faulty parts, but nothing seems to be wrong. Security Essentials and Malwarebytes find nothing, my CPU and MoBo stay at a cool 20-35c and with every test I could find and run it would appear everything is installed and working properly.

These crashes only started happening about a day ago, but being a bran new computer I'd like to solve it sooner rather than later.

The only thing that comes to mind at this point is power. I have a plenty big PSU (850w) and I have a bran new surge protector and I'm in a new apartment. The one thing that I feel may be the issue is the amount of power I'm drawing on from this one outlet alone. I have my 850w PSU, a 23" Monitor, a Network splitter, and an Xbox 360, all plugged into that one powerstrip.

The crashes have only happened while I was working on my PC (extracting files/converting them) and using the Xbox at the same time. This leads me to believe that maybe I'm drawing to much power? Or that not enough is getting to my PSU?

That's all I've come up with and I'm hoping someone else with a little more know-how can help me with this. Would buying a UPS help at all or am I just wasting my cash?

Here's my PC specs if anyone needs them:

OS:::: MS Windows 7 Pro 64bit
CPU:::: AMD FX-6100 Six-Core @ 3.3GHz stock (OC'ed to 3.8GHz)
RAM::::24GB (4+4 and 8+8) Dual channel DDR3 (9-9-9-24)
Motherboard:::ASUS M5A97
Graphics::::AMD Radeon HD 6850
HDDs::::1TB + 500GB 7200rpm

I use it mostly for Gaming and working with high resolution images in Photoshop (upwards of 5,000x12,000pixels) as well as the occasional 3D model in Blender.

Thanks in advance to anyone with a little feedback!!

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