You did not mention whether it kicks back down after a time. Whether the room temperature is comfortable or warmer. Whether the box located on top of the desk or in the kneewell, etc. Whether you have ever cleared out the accumulated dust bunnies inside. Be that as it may, I'd also recommend looking in the task manager <CTRL-ALT-DEL> to see if CPU performance is running high, a sustained 50-90%, or if some process is using a lot of CPU cycles.
Subject: CPU Exhaust Fan Running In Super Fast Mode What does it mean when the fan on a Dell Dimension 3000 starts running at very high speed about a minute after boot-up and stays there? The system is less than two years old and it runs Windows XP.
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