Newly Built PC Powering Down for Unknown Reason (Help Needed)

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fencer3012

New Member
Hello, I recently built a computer about two weeks ago and everything was fine up until a couple days ago when my computer started randomly shutting down for no apparent reason. The first time it happened, I was playing a game on all high settings. Thinking it was an overheat, I simply stopped using the computer, hibernated it (did not shut it down), and let it cool down overnight. The next day, I came home and tried to turn on the computer. It booted up fine, however I had barely gotten to the logon screen when it powered down again. I gave it about 10 minutes and then tried again. However, this time it booted up fine. Logged in, and started playing games as usual. About 20 minutes in, it powered down again. I'm absolutely baffled right now as to why this is happening, because the computer is so new. My regular processor temp is 40 degrees C and my boot drive stays around 29-30 degress C. I am running on Windows 7 64 Bit. Below are my specs:

Phenom II X4 955 Black Edition Deneb 3.2GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM3 125W Quad-Core Processor
ASUS M4A78T-E AM3 AMD 790GX HDMI ATX AMD Motherboard
APEVIA X-TELSTAR-RD Red/ Black Aluminum ATX Full Tower Computer Case
CORSAIR XMS3 DHX 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Dual Channel Kit Desktop Memory x2 (8 gigs of ram)
HIS H487Q1GH Radeon HD 4870 1GB 256-bit GDDR5 PCI Express 2.0 x16 x2 (two of them)
Seagate Barracuda 7200.12 ST31000528AS 1TB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive (Storage drive)
Seagate Barracuda 7200.12 ST3250318AS 250GB 7200 RPM 8MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive (Boot drive)

Any help is very much appreciated, thank you all in advance. I will frequent this thread, so please ask any many questions as you need to.
 
You may have a faulty piece of hardware or did you put your anti-static pads behind your motherboard? If not your motherboard could be shortening.. Classic nooby mistake even i do it sometimes :o
 
While that power supply is adequate in many ways. you need to look at much more than just wattage. You should consider amperage and reliability (reviews and such). Just FYI...

And regardless, even if the PSU has enough power on paper, that doesn't mean it's not malfunctioning. If possible, find a replacement to confirm.

If you can't for some reason, perhaps try some Linux Live CD for a while. Maybe try and run some stress tests under Linux too. If the problem persists, you can at least know it's not related to Windows/your software.
 
Sometimes you get a faulty powersupply, and corsair are usually good with not getting a dud one in the first place.

Before trying to RMA/send anything back, I'd take apart the computer and build it on a piece of cardboard to make sure it isn't a short.

Did you install the brass standoffs into the case before you put the motherboard in? If not, that could also be a problem, as it's shorting out
 
Check your voltages, and make sure there running the right clock.
My friends pc would shut off randomly, freeze up at first. He noticed his 12v rail was running significantly lower, he has a corsair 750tx.
 
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