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computer turn off & on by itself !!!!

my computer turns off by itself, and then turn on ... it does a self restart without me doing anything?
it's like when i cut the power the return it.

Please,, Can anyone help me??

I have windows xp profesional installed only
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saif007
Asked:
saif007
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1 Solution
 
CallandorCommented:
It's probably not shutting down, but restarting.  Look at this site for possible explanations and resolution: http://aumha.org/win5/a/shtdwnxp.php
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saif007Author Commented:
Mr. Callandor

please know that the pc do that before windows startig .
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CallandorCommented:
If the machine shuts down within seconds of turning on, this can be due to the cpu heatsink fan not functioning or the power supply failing.  You will have to check if the fan is plugged in correctly and working by opening up the case.  It could also be the power supply, in which case you need to try to install another one that is at least as powerful.
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CallandorCommented:
Also check the power on/off button to see if it is stuck in one position.  You can switch the connection with the reset button to test this.
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saif007Author Commented:
Mr. callador

i check proccesor fan,,,i found it doesn't working,,, when i move it,,, its working ,,, but now, when i open pc, the doesn't turning of by itself.
the problem now that the pc stop on booting stage...
please help me!!!
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CallandorCommented:
You need to replace the fan - it's sounds broken.  It's probably a 3-wired one, and you need one of the same size as the original so that you can install it in the same location.  If you have an AMD cpu, this has to be done or you will burn up the cpu, but Intel cpus need it too.
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