Bad case fan?

My case has occasionally makes a weird buzzing noise. The only way to stop it was to push down on the top of my case. After getting some help from you guys, I made sure the optical drive and hdd was fully secure. I tracked the noise and it seemed to be coming from my top case fan, but I'm not 100% sure. I have the Rosewill Challenger. I also realized that the rear fan blows out more air than the top fan. Is there something wrong with my top fan??
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  1. Try unplugging it and seeing if the noise stops

    if it does replace it
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