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Discussion Starter · #1 ·
About 6 months ago my computer started shutting itself off when I was gaming. It wouldn't happen often, but as time went by the frequency increased. I thought it might be due to overheating of the cpu and got some software to gauge the temperature. The cpu usually ran in the high 50s (centigrade) and sometimes would hit 60-62. That's the hottest I've seen it go. I recently installed a cooling system and now it never gets higher than about 42 degrees; however, I'm still having the shut down issue.

There's no warning when before it happens, and when it does, it's like someone pulled the plug on the computer. It just goes dead. Additionally, the computer won't restart unless I disconnect the AC cord from the back of the computer for about 30 seconds. When I unplug the computer, I can tell when it's okay to reattach the plug by listening for my usb scanner to reset (I've even left it sit overnight and tried to restart it without disconnecting the AC cable, but it won't work. I have to disconnect it). If I reattach the plug before that, the computer won't start.

Any ideas on how to go about diagnosing this problem? I'm guessing some component got damaged because of the heat, but I have no idea how to figure out where the problem is.

Thanks.

Tech Support Guy System Info Utility version 1.0.0.1
OS Version: Microsoft Windows 7 Home Premium , 64 bit
Processor: AMD Phenom(tm) II X4 965 Processor, AMD64 Family 16 Model 4 Stepping 2
Processor Count: 4
RAM: 8190 Mb
Graphics Card: ATI Radeon HD 4800 Series , 1024 Mb
Hard Drives: C: Total - 953868 MB, Free - 763798 MB; I: Total - 953867 MB, Free - 421647 MB;
Motherboard: Gigabyte Technology Co., Ltd., GA-MA770T-UD3P, ,
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Try this

Download and install hwmonitor
and see what the temps etc are. Download the 1.17 setup, english on the righthand side.
....take a reading when not running the game or programs CPU(core) and GPU Video card and post them. (Just a screenshot of results is fine)

Then run the game or any other intensive program for 10min or so and take another reading post the results
 

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From the symptoms, it is your power supply shutting down. Normally the shutdown and refusal to restart is a reaction to a detected serious output anomaly.

Presuming you don't have an intermittent short in the box (and you could...check that all wires are properly bundled and routed, and look for evidence of mechanical damage to insulation, or possibly a brass standoff where a plastic one was needed, or some such) then most probably the power supply itself is faulting.

You didn't specify a model for the power supply.

edit:

Also, letting that Phenom-II get to 62 degrees put you right on the edge of its allowed specification. Do that a few times, and you'll damage it. Good thing you put in a cooling system.
 

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Discussion Starter · #11 ·
Over the past few months, it's happened more than a few times. I knew that the cpu was running on the hot side when I had a game running. I was monitoring it and trying to see if there was some temperature threshold at which the shut downs occurred. It ranged from around the high 50s to low 60s consistently, so heat was a candidate for the cause of the problem, but the fact that I have to physically disconnect the psu cord from the unit before it will restart was making me wonder if some kind of electrical issue wasn't really going on. I wound up buying the Coolit Vantage system. And while it didn't solve the problem, it sure impressed the hell out of me.

I'm thinking about what you said about a short being a possible cause. I tend to think not because the shutdowns only happen when I'm running a graphics intensive game. If I'm wrong correct me, but I think a short in the case would be more inconsistent than that.

Swapping out the psu won't be as much of a headache as finding a short, so I'll go that route first. Is there anything I need to know about shopping for a psu? I've only ever had to buy one in the past and that was when PCs were a helluva a lot simpler than they are now.
 

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Yeah, you have a cheap power supply, without doubt. If it was a good supply, it would've been identified by name in that package.

Probably the power supply won't deliver the rated 700 watts anyway, and most likely it is shutting down due to overload on its 12V line, or internal overtemp (though not all supplies will turn themselves off for that...particularly not cheap ones.

The only power supply reviews on the web that you should pay attention to are the ones here. I know of no other source on the web that properly tests power supplies, and these people are knowledgeable and thorough.
 

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Discussion Starter · #20 ·
I finally found the time to install a new psu. I bought an 850w modular Corsair unit and have put some hours on it this weekend. No more random shutdowns.

THANKS FOR ALL THE HELP!
 
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