(HELP!!) Can dust slow down a PC fan?

Short answer : Yes.

Your scenario sounds like the fan was stuck and opening the case nudged it back into life. Dust and fluff can find their way into bearings and form a gummy substance when the combine with oil and grease.

Are you sure that some debris hadn’t jammed the fan?
Thank you for your response. I don't know what this could be but it just seems a really coincidence that as soon as a open my front and took the dusty filter off, it stopped. Do you think I should be worried?
 
I have a question, is it possible to over volt a fan? Would that cause the grinding problem I have?
Like plugging in a fan to pin connecter that put out more than it requires or will it just take what it needs?
 
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