Computer suddenly turns off.

I recently changed computer and it usually works pretty well.
Unfortunately it seldom turns off without any apparent reason: just puff, gone.
I thought it was problem of heating, so I used mprime for about six hours in torture maximum heat mode. The CPU warms, but it never goes over 60 Celsius. Also the test do not give any error.
So I tried burning my video card, I find nothing made explicitly for Linux so I used FurMark via Wine. Once again the GPU warmed, but it never reached critical levels.
I also tested the ram using application in the ArchLinux install CD, nothing wrong.
In all cases the computer did not shut down.
It happened today again when I was relaxing playing track mania freeware... I am out of ideas, do anyone had similar problems? The only pattern I can see is that happen when playing 3d games in Wine.
Insight? Ideas? Other tests I can try?

davidm wrote:How's your power supply?
If you mean the PSU it is new as the computer. It should be fine: but how can I check it?
If you mean the mains electricity I am not actually sure. But the old computer never had similar problems.
SemiBz wrote:1. Check log files
Good idea, next time it happens I'll write down the time and see the logs.
SemiBz wrote:
1. Check log files
2. Check BIOS ( CPU heat protection, probably on newer ones such function exists for other parts as well )
If you don't have ANYTHING to start with, it'll be hard to determinate the source of this behavior.
Since the computer turn off without warning it is hard giving something...
About Bios: the computer should shut down when it becomes too hot, but temperature never goes so high.
Cyrusm wrote:other possibilities:
did you build the computer your self? because there might be inter-hardware compatibility issues that you aren't considering
(i.e. your motherboard is incompatible with your processor)
Yes, I build the computer. As far as I know there are no incompatibilities, how can I check? just googleing the parts name?
Anyhow, thanks for the help. I'll write down the log next time, eventually get a multimeter and check the power supply.

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Hello,
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Could it be a problem of this specific battery? Or maybe just the MacBook doesn't accept batteries like that one? It's not original.
In the first case, I would return the battery to get my money back. In the second case, I guess I should have bought an original one.
Additional data that may be useful:
Mac OS X 10.8.5 (12F4S)
EFI boot ROM version: MB71.0039.B0E
SMC version: 1.60f6
About EFI boot and SMC versions, those are the last available official updates, obtained from here.
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Welcome to Discussions - which model do you have (how to identify your iMac)? It may be that your power supply unit is failing, see if you qualify for either of these Rev A and Rev B repair extension. You might also try cleaning the air vents and vacuuming the inside of your machine (don't open it if it's an iSight). Some people train a fan on the rear of their iMacs if their rooms are very hot, it helps keep the computer cool.
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Message was edited by: Linda - PBCS

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Here is what to do;
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3. Carefully unplug the battery from the logic board.
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Hi Sian.riches,
Welcome to the Apple Support Communities!
I know it can be both concerning and frustrating if your iPhone will not turn on as expected. I also know your have done some great troubleshooting already. I would suggest reading over the attached article and trying the troubleshooting steps provided to ensure everything has been done.
iPhone: Hardware troubleshooting
http://support.apple.com/kb/TS2802
Will not turn on, will not turn on unless connected to power, or unexpected power off
Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
Check if a Liquid Contact Indicator (LCI) is activated or there are signs of corrosion. Learn about LCIsand corrosion.
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After at least 30 minutes, if:
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The low-battery image appears, even after the phone has charged for at least 20 minutes: See "iPhone displays the low-battery image and is unresponsive" symptom in this article.
Something other than the Home screen or Low Battery image appears, continue with this article for further troubleshooting steps.
If the iPhone did not turn on, reset it while connected to the iPhone USB power adapter.
If the display turns on, go to step 4.
If the display remains black, go to next step.
Connect the iPhone to a computer and open iTunes. If iTunes recognizes the iPhone and indicates that it is in recovery mode, attempt to restore the iPhone. If the iPhone doesn't appear in iTunes or if you have difficulties in restoring the iPhone, see this article for further assistance.
If restoring the iPhone resolved the issue, go to step 4. If restoring the iPhone did not solve the issue, seek service.
Have a great day,
Joe

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Charge it with a wall charger for 15 minutes, then hold the HOME and SLEEP buttons until an Apple logo appears, about 10 seconds.

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If you have not taken the iPod apart, Apple will exchange it for a refurbished one for $99. You can do it an an Apple store
- Make an appointment at the Genius Bar of an Apple store.
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cutieliz wrote:
What do u think is the prob ?
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steps665 wrote:
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Computer suddenly turns off.

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