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The OptiPlex 755 is an energy-efficient desktop computer designed for businesses. It was released in mid 2007.

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Why is my fan making noise when I turn on the power button

the fan of my computer is making a strage sound when I'm starting to turn the power on , I need assistance on how to fix it

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Take a look at the fan and see if it is clean. There could be dust on it.

Here is a link to the manual:

https://dl.dell.com/manuals/all-products...

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@aactech thanks Mike I will make a follow up

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It could be it is loose, dirty or the bearing are bad/worn maybe something else but those are I would think it would be

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