There may be a problem with your computer when it produces loud fan noise. Sometimes the cause is temporary but occasionally permanent, which requires more attention. The sound can be caused due to different reasons, Geek Square, a computer repair service in Toronto mentioned few of them below.
3 Reasons For Fan Noise
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The first reason is that sometimes computers are overheated due to which the heat can't dissipate fast enough. Hence, the fan-run harder and louder.
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It may also be possible that there is a problem with the software, which can also cause a fan problem. Moreover, fans with broken blades can also produce a loud noise.
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The loud noise of the fan can also be due to vibrating against the computer tower's casing, or another part inside the computer.