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I am running Windows XP Home SP3 on a Dell Dimension 4550 PC.
In January the fan inside the heat sink quit working so I had it replaced and it's been working properly as best as I am able to tell. Yesterday after several hours I noticed that I was able to hear it when before it was almost silent. Today when I first turned on the PC it was quiet but after about 4 hours the fan was noticeable. It is blowing cool air and and there hasn't been any warnings and I checked the CPU and it said that it was working properly.
Am I being overly sensitive to the noise? How loud is too loud?
Is there a diagnostic to tell if everything is ok? The Dell "Support" doesn't give any information about fans at all. I did clean all of the dust before the new fan was installed.