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Noisy cold start


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#1 Train2104

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Posted 10 May 2011 - 05:19 PM

Powerspec PC from 2005 w/ Pentium D and XP Media Center.

When I start it up "cold" (i.e. off for at least 4 hours), the computer starts with a loud fan noise. After about 45 seconds to 1 minute, the noise begins to taper off to normal. This does not happen if the computer is started when it is warm. The problem began a couple of years ago, but it has gotten worse progressively. What could be happening? Vacuuming the PC doesn't help, although I didn't open up anything other than the side cover.

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#2 Eyesee

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Posted 10 May 2011 - 05:39 PM

Can you give us the complete make & model of the system please.

Most likely the noise you hear is a fan. My guess would be the power supply fan.
It may just need to be cleaned.
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#3 Train2104

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Posted 10 May 2011 - 06:18 PM

Can you give us the complete make & model of the system please.

Most likely the noise you hear is a fan. My guess would be the power supply fan.
It may just need to be cleaned.


It is a fan. But why is it only making noise when it's cold?

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#4 dc3

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Posted 10 May 2011 - 06:25 PM

The question is how cold are we talking about.

My house gets down in the fifties F in the winter if I forget to bank the wood stove which results in the fan on the PCU running much faster than normal until it warms to a normal operating temperature. I'm guessing that the resistance of the thermistor or diode (the thermal sensor at the base of the CPU) which will indicate an increase in temperature will also reflect an opposite reaction with a severe lower temperature causing the fan speed to increase.

Edited by dc3, 10 May 2011 - 06:26 PM.

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#5 Train2104

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Posted 10 May 2011 - 07:14 PM

The question is how cold are we talking about.

My house gets down in the fifties F in the winter if I forget to bank the wood stove which results in the fan on the PCU running much faster than normal until it warms to a normal operating temperature. I'm guessing that the resistance of the thermistor or diode (the thermal sensor at the base of the CPU) which will indicate an increase in temperature will also reflect an opposite reaction with a severe lower temperature causing the fan speed to increase.


Temperature of the room will not affect it much. Like a car, it starts better when it hasn't been shut down for too long. Comparing summer to winter (58 to 80 degrees), the winter is a bit louder, but very little. The summer start is still noisy.

When the computer is under heavy load and the processor heats up, the problem does NOT come back.




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