> Assuming there is nothing in your Event log to indicate system problems:
>
> 1. Check that your PSU is not failing - fan or component failure can cause
> it to overheat and deliver variable power before eventually giving up
> altogether.
>
> 2. Check for dust build-up between your CPU fan and heat sink. If you
> shine a light through the fan you should see the cooler fins clearly. If
> you can't, remove the fan and clear the dust mat.
>
> 3. Any failing component - internal or external - can cause intermittent
> problems. Disconnect or remove everything non-essential and replace them
> one by one until you find the problem component.
>
>
>
> "wotens" <ulfl[ at ]yahoo.com> wrote in message
> news:uTI3FdPOJHA.4372[ at ]TK2MSFTNGP04.phx.gbl...
>> Hi,
>> What can be wrong with my computer? The OS - Windows XP Pro 64 - turn on
>> and off all the time. This is something that started 2 month ago, and
>> before that It have worked without any problem. I have not change any
>> hardware of pheripheral, it is exacly the same as it was when it worked
>> without any problems; the only difference can be that I now have SP 3
>> installed. No change in the software.
>>
>> happy for an answer,
>> Ulf
>>
>>
>