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PC shuts down like power cut

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  • New Build
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Last response: in Systems
June 17, 2010 7:48:03 PM

OK guys, just completed new build about a month and a half ago and need some advice. My new build is as follows:

Silverstone FT02-B
Core i7 930
Thermalright Ultra-120 eXtreme-1366 RT Rev. C CPU Heatsink
OCZ 6GB (3 x 2GB) DDR3 1600 RAM
SAPPHIRE Radeon HD 5850
SeaSonic X650 Gold 650W Power Supply
Western Digital Black 750GB HDD
Western Digital Green 2TB HDD
Win7 x64

For the first 3 weeks I had only 1 crash. Then after using it for 3 weeks(about a month ago now), I had 1 shut down on Friday, then 2 on Saturday, and then 5 or 6 on Sunday. I say "shut down" because it was just like what would happen if you pulled the power cord, and it required me to press the power on the front to start it. The crashes seemed to be more frequent to the point I was lucky to boot into windows, sometimes it would crash on the bios load, and several times in memtest (though no ram errors were ever present). I thought it was the power supply, but I wasn't positive, so I changed the setting in the bios to turn on with power loss, but the computer still required me to push the power button on the case to restart. So I assumed it was the mobo, until I chatted with a friend who stated that power supplies and mobo have fault protectors that require manual restart to prevent damage. Windows was set to run error log, but this only occured once despite the many shutdowns, it just "shut down".

I had no overclock on and then went to standard motherboard bios settings with lower voltage for ram and QPI. The crashes were less frequent, but they still occured quite often. I was quite busy with school so I pulled out my old rig and set this aside until my big class was done.

When my class finished last week I tested it and it still had the same "shut down" problem. So I ordered a new power supply, it came on Monday. I was installing it and noticed two of the Peripheral/IDE/SATA modular power cables were not latched in and easily fell out. I wondered if this was the problem, but figured I'd try the new power supply first.
That power supply resulted in 72 hours straight with no crash. Then yesterday evening I tried the old power supply. I plugged everything in and double checked it, guess what, no crash for 24 straight hours and counting. So...

Can a loose Peripheral/IDE/SATA modular power cable ause this???

Does this sound like the Power Suppply (in this case my *** install skills) are at fault for the crashes?

The old power supply has a 12V line that read 12.58V in the bios, the new one read 11.9V Should I return the old one for this variance?

Any other thoughts???

More about : shuts power cut

June 18, 2010 2:47:56 AM

For those wondering, I tested for 24 hours in memtest before install of windows and 72 hours in prime95 once windows was installed. I am busy, but very rarely take short cuts, that's why the "looseness" of these cords really struck me.
a c 121 B Homebuilt system
June 18, 2010 7:00:02 PM

Can a loose ... ? Probably not.
Does this sound ... ? Possibly.
Should I return ... ? I wouldn't. 12.6 volts is the upper edge of in tolerance. I'd borrow a multimeter to verify what the BIOS is telling me.