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PC Shuts Down Unexpectedly


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#1 lsb188

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Posted 27 June 2009 - 04:37 PM

My Systemax PC has begun shutting down enexpectedly. Sometimes it will go several days, other times several hours. I have replaced the power supply with a new 500W unit from TigerDirect (OEM unit was 350W), and I have cleaned the entire inside of the PC with a vacuum (altough there are a feww spots I could not get clean - too small a space). No new hardware or software recently, no viruses or trojan horses. Please offer any suggestions. Thanks.

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#2 fairjoeblue

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Posted 27 June 2009 - 05:38 PM

You may have cleaned the obvious dirt out but overlooked what will cause the problem.

Ifr the CPU fan/heatsink is clogged with dirt/dust it will cause the CPU to overheat & the computer to shut off.
That may not happen until a CPU intensive program is used.
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#3 garmanma

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Posted 27 June 2009 - 06:16 PM

We have a tutorial on how to clean the interior
http://www.bleepingcomputer.com/tutorials/cleaning-the-inside-of-your-pc/
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#4 lsb188

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Posted 27 June 2009 - 09:06 PM

Thanks, guys...great advice. I especially liked that tutorial...printed it out for the cleaning job tomorrow. Many, many thanks.

#5 polarpimp

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Posted 28 June 2009 - 08:46 AM

i hav the same problem

#6 lsb188

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Posted 30 June 2009 - 09:29 PM

So I followed the tutorial to the letter...lots of dust now gone. And the damn thing is still shutting down. I downloaded a program called SpeedFan to show the temperature of the CPU and the speed of the different fans in the PC, and all is normal - well below max temp per AMD. Also, I downloaded a memory test program called MemTest...and the RAM passed with no errors. What's next? New power supply, fairly new video adapter (6 months)....what could it be???

#7 lsb188

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Posted 08 July 2009 - 06:34 PM

A new twist - I have been shutting down Outlook 2007 after checking email to prevent the "Outlook did not shut down properly...." message upon reboot, after a shutdown. Amazingly, since I started doing this, the PC has not shut down! So...could Outlook 2007 be the culprit here?? Anyone here of this, or hear about any Outlook issues? I did take the most recent Outlook update from MS, but I have not yet installed SP2.




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