CPU Fan Sometimes Works

Hey guys, I searched for forums before posting this and I still don't see a solution. I've had my computer for about 3-4 years and a couple of months ago my CPU fan died. I bought the same exact fan with the heat sink that came with it, but only used the new fan inside. Though sometimes when I turn my computer on, the fan doesn't want to turn on. I've air dusted it, unplugged and replugged, removed all my usb connections. And sometimes these fix the problem...but not today. Could it be my motherboard? Heat sink?
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  1. Sorry, I did not mean to post this topic twice.
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