Random Shut-downs on Homebuilt computer

Hey guys, I've posted this problem on these forums (about 2 months ago), and I've gone through most the options I'm aware of for resolving it. I'd love to here some new suggestions.

System Background/Problem
My system, built in August 2010:
Mobo: Gigabyte X58A-UD3R Mobo (
CPU: i7-930 (
PSU: Corsair TX850 (
Graphics Card: PNY Geforce GTX 470 (
RAM: Muskin Redline 6 GB-3x2 (

Overheating isn't an issue: Xigmatek heatsink and HAF X case.

About 3 months ago, I woke up, and my PC had shut down. I tried to start it back up, and the computer attempted to (LEDs/fans started up except for LEDs/CPU fan), then it powered down. I tried to start it up again, and 0 response.

I decided to test my PSU and used the Corsair video where I disconnected it from my Mobo, bridged the cable via a paperclip, and found the PSU working fine. I reconnected it to the Mobo, and this time my computer successfully restarted. However, the computer's clock has been reset to 1/1/2010 at 12:00 AM, 12/1/2009 at 12:00 AM, or another rollback to some other point (it changes).

Since then, it's happened anywhere from three times daily to once a week with increasing frequency, sometimes when I'm using it (minute tasks: Microsoft Word//no auto save, lost a lot of work) and sometimes when I'm asleep. Occasionally it will happen while I game, but that hasn't happened in awhile. It's most commonly when I'm not using it. Temperature readings are all fine.

Every time I have it shut down, I have to go through the same process as I mentioned above. For instance:
1. Random shut-down mid essay
2. Try to restart: LEDs/Fan briefly turn on, then off. Reattempting the start up after this has no effects. CPU fan/LEDs do not light
3. Turn off PSU
4. Disconnect PSU and Mobo; Reconnect
5. Power-up works. If it doesn't, I go through 2-4 until it works again (might have to do this up to 20 times).

What I've tried
I talked to a friend of a friend that is into home-builds, and he suggested a few things:

1. Run Mem86 to check my memory (I did; 10 passes with 0 fails)
2. Look at my CPU underneath a microscope and check if anything is bent. I have not tried this. I no longer have access to one either (finished undergrad/research until September).
3. Reseat my CPU (I will be trying this in the upcoming week).

I talked to Gigabyte, and they requested that I test each part independently to isolate the issue. I don't have an extra mobo, so this is difficult to do since I might have to borrow one up to a week.

What I'm asking
Last time, the only suggestion was that I was in the hands of a failing mobo. Would that still be the most likely culprit to this issue?
2 answers Last reply Best Answer
More about random shut downs homebuilt computer
  1. Best answer
    Either your motherboard or PSU. Sometimes a PSU can power on, but still give weird voltages / not work properly. I'd say test another PSU and see if that helps, otherwise, It's almost definitely your mobo...
  2. Best answer selected by demope.
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