Why does my CPU fan make so much noise during boot up?

susendeep dutta February 19, 2011
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I have an Intel Pentium D 820 Dual Core 2.8 GHz and using it’s stock cooler.

Whenever I boot my PC, there comes such a violent noise from the fan that it seems to be going to break into pieces. I have manually cleaned the CPU fan for two times in two weeks, but still the same issue. The stock cooler seems to be tight with the motherboard. The HDD temperature goes up to 49 degrees within half hour.

Please help me troubleshoot this problem.

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