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Unexpected Re-boot


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#1 novirusplease

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Posted 13 August 2006 - 05:52 AM

I have already posted this issue a few months ago. As I could not find any replies that solve the problem, I am posting it again in the hope that someone will have a working reply.

I run WinXP SP2 on a M811 MoBo, AMD 1.8 GHz Duron CPU. I have one 1 Gb DDR RAM (which is oddly identified as 512 Mb by the BIOS and WinXP).

The PC runs fine and all software under WinXP can be used normally. However, it systematically re-boots after a certain period of time which ranges from 2 hours to 15 min. This time decreases with the number of re-boots. In the end, it cannot boot at all. These last days, the first re-boot takes place after only 15 min and the PC is freezed only a few re-boots.

First, I thought that it was due to an overheat so I added a 12cm case fan. In the BIOS, the CPU temperature is shown to be 36-38C. To decrease even more the temperature, I directed my personal fan (35 cm diameter) to the motherboard at maximum speed (at this speed it blows out all paper on my desk). It did not help at all. I then checked the contact surface between the cooling block (with Arctic Copper Lite fan) and the CPU, put some new thermal paste but it did not change anything. As fas as I know there is no leaking of any sort from the MoBo components (I am no electronic expert though).

Is it possible that the re-boots are not linked to an overheat?

Any guidance is highly appreciated.
Thanks in advance.

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#2 Mr Alpha

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Posted 13 August 2006 - 05:57 AM

Have you tried to run the hard-drive manufacturers diagnostics program to see if there is anything funky going on with the hard-drives?
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#3 Enthusiast

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Posted 13 August 2006 - 07:52 AM

The fact that the bios does not detect half the ram leads me to think that a problem with the ram may exist.

I suggest doing some ram testing:

RAM tests
http://www.simmtester.com/page/products/doc/download.asp
http://oca.microsoft.com/en/windiag.asp
http://www.memtest.org/
http://www.memtest86.com/

Also, when you added the new thermal paste did you thoroughly clean off the old paste both on the processor and the heat sink?

Just as a curiousity - Download Everest Home Edition V 1.51 which is the last freeware version that includes the software module which lists all software installed on your computer and provides all the license key numbers – a great tool which has been deleted from all successive freeware versions.

Download here from the Utilities section:
http://www.oldversion.com

Run this and see what it shows about your ram.

Edited by Enthusiast, 13 August 2006 - 07:54 AM.


#4 novirusplease

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Posted 13 August 2006 - 09:43 AM

Thanks for your prompt replies.

I run the Windows Memory Diagnostic program. My PC passed all 6 tests successfully (the 6th test took suprisingly long to complete, at least two hours).
--
I carefully cleaned up the cooling block and the CPU before putting new thermal paste.
--

Is there anything else that could eventually solve the systematic re-booting?
Any further guidance is sincerely appreciated.

#5 novirusplease

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Posted 13 August 2006 - 12:33 PM

I did some search on Google. Can anyone confirm that the power supply may indeed be the cause of re-boots although symptom points out something else?

My PSU reads 300W and 14A/12V (cannot find any brand on it). I suspected the PSU might be a bit weak so I unplugged the monitor (double-plug PSU) and connected it independently. The power supply calculator says that I need 267W (without monitor; source: http://journeysystems.com/power_supply_calculator.php). I am not sure if my PSU is really able to supply 300W as stated on the label. I just need some feedback from anyone else.

Is there anyone having experienced such a problem?

#6 novirusplease

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Posted 19 August 2006 - 01:01 PM

I can now answer my last question myself.

Yes, the power supply may cause unexpected re-boots if the total power does not match the PC needs. Also, the motherboard supply (20 pins) should have sufficient power (12V and >18A) to ensure a stable usage. In my case, the power supply needed is at least 380W and 12V/20A.




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