GA-990FXA-UD3 Computer randomly shutsdown

[Vanionator]

Gigabyte GA-990FXA-UD3
Kingston HyperX Black 8GB (2 x 4GB) DDR3 1600Mhz
Kingston SSDNow V300 Series 120GB SATA3
Seagate Barracuda 1TB 64MB Cache SATA3
LG GH24NSC0 24X DVD-RW
iMicro All-in-One Multi Card Reader
Major Brand nVidia GTX 760 2GB GDDR5 PCI-E
Onboard 8-Channel HD Audio, Onboard Gigabit LAN
Enermax ECA3212-BL(U3) ATX Mid Tower
Thermaltake TR2 600W ATX
AMD FX-8350
Eight Core 4.0GHz

I got this comp on Friday, just past, installed Windows 7 ultimate and everything seemed great.  I installed coolnovo(web browser) and then it completely shudown. After several attempts at fixing it, I just figured that my W7 was corrupted or damaged, so I went out and purchased Windows 8.1. Everything was working and then this morning, it shutdown again. Seething, I started it and was told that it was a bios failure and that I needed to put in the W8.1 disk and basically, reinstalled it.
I started working on the comp today and it shutdown again.
Any ideas as to what could be causing this? I am extremely frustrated here.

BIOS version F2, date of bios 7/15/2013 and the ID is 8a02bg10
Flash type size is MXIC 25L3206E 4MB.

Thank you.

[Vanionator]

I looked at the event viewer and it showed me the Kernel Power 41 error. Too bad that it doesn't tell you what caused it.

[Vanionator]

I installed Core Temp to monitor the temp.
On the case, there is suppose to be a fan, located in the front, near the bottom. I don't think it was ever on as it has lights on it and they've never been on. I tried one of the buttons and it came on, so I started the computer. So far so good.
Does anyone think that that could have been the issue?

[JGB123]

Gigabyte GA-990FXA-UD3
Kingston HyperX Black 8GB (2 x 4GB) DDR3 1600Mhz
Kingston SSDNow V300 Series 120GB SATA3
Seagate Barracuda 1TB 64MB Cache SATA3
LG GH24NSC0 24X DVD-RW
iMicro All-in-One Multi Card Reader
Major Brand nVidia GTX 760 2GB GDDR5 PCI-E
Onboard 8-Channel HD Audio, Onboard Gigabit LAN
Enermax ECA3212-BL(U3) ATX Mid Tower
Thermaltake TR2 600W ATX
AMD FX-8350
Eight Core 4.0GHz

I got this comp on Friday, just past, installed Windows 7 ultimate and everything seemed great.  I installed coolnovo(web browser) and then it completely shudown. After several attempts at fixing it, I just figured that my W7 was corrupted or damaged, so I went out and purchased Windows 8.1. Everything was working and then this morning, it shutdown again. Seething, I started it and was told that it was a bios failure and that I needed to put in the W8.1 disk and basically, reinstalled it.
I started working on the comp today and it shutdown again.
Any ideas as to what could be causing this? I am extremely frustrated here.

BIOS version F2, date of bios 7/15/2013 and the ID is 8a02bg10
Flash type size is MXIC 25L3206E 4MB.

Thank you.

I have no experience with the...

GIGABYTE - Motherboard - Socket AM3+ - GA-990FXA-UD3 (rev. 4.0)
http://www.gigabyte.com/products/product-page.aspx?pid=4672#bios

...but until someone more knowledgeable comes along trouble-shooting is trouble-shooting:

- What's the make & model of the CPU cooler?
- Are you over-clocking anything?
- Did you assemble this PC yourself? (Nothing shorting out the m/b? Proper application of thermal grease? All buttons and LEDs plugged in at the correct polarity etc?)
- Have you tried a process-of-elimination (ie disconnecting all non-essential hardware then testing the PC for a day or so before reintroducing components one-at-a-time. I'd start with the multi-card reader)?

Just with the CPU and the GPU alone it appears that you've got 350 Watts draw on a 600 Watt power supply:

"Thermal Design Power 125 Watt"
AMD FX-Series FX-8350 - FD8350FRW8KHK / FD8350FRHKBOX
http://www.cpu-world.com/CPUs/Bulldozer/AMD-FX-Series%20FX-8350.html

"Power Consumption up to 225W1 additional 8 pin PCIe power required"
Graphics Cards - GTX760-DC2OC-2GD5 - ASUS
http://www.asus.com/Graphics_Cards/GTX760DC2OC2GD5/specifications/

Others more knowledgeable than I may claim this is sufficient but when it come to P/S units I prefer the belt & suspenders approach.

But before you spend more money please try some further trouble-shooting.

BTW:

Motherboard Safety with 125W+ TDP processors
http://forum.giga-byte.co.uk/index.php/topic,15142.0.html

[Vanionator]

Thanks for your reply. I took it back to the builder and it was the power supply. I hadn't considered that because it's a new machine. They felt bad and gave me a better power supply at no cost. Well, no cost to me.

[JGB123]

Good.