What various weird computer noises mean for your machine

This article has been updated. Originally published August 30, 2020.

No computer is perfectly silent, but excessive noise is a warning sign. If your PC sounds like a lawnmower, it's time for investigation. Understanding the different sounds your hard drive makes can prevent costly repairs or even data loss.

Clicking, Grinding, or Buzzing Noises

A distressed computer's soundscape.

Clicking, grinding, or low-pitched buzzing often points to a failing hard drive. Immediately back up your data using tools like CrystalDiskInfo (Windows) or DriveDx (macOS). These utilities assess drive health. If your drive shows anything less than "good," act swiftly. While a "caution" status might allow some time, noises signal imminent failure. Consider upgrading to a Solid State Drive (SSD) for improved speed and longevity. Regular backups are crucial for all hard drives.

If the hard drive is healthy, investigate other sources. A failing DVD drive or a cable caught in a fan are possibilities. Inspect your PC's interior for obstructions.

Loud Whirring Noises

High-speed fan noise isn't relaxing.

High-speed fan noise often indicates overheating. Check CPU usage in Task Manager (Windows) or Activity Monitor (macOS). High CPU usage necessitates increased fan speed. Close unnecessary programs or run a malware scan. Tools like Core Temp (Windows) or Fanny (macOS) monitor CPU temperature. Temperatures above 70°C (158°F) while idle are abnormal. Improper ventilation (e.g., using a laptop on soft surfaces) and dust accumulation can cause overheating. Clean fan vents and consider adjusting fan curves in the BIOS (accessible by pressing Delete during startup) for desktop PCs.

Speaker Noise Without Audio Playback

Mysterious speaker noises.

Noise from speakers when no audio is playing suggests a connection problem, feedback, or ground loop. Check speaker cable connections. Test speakers with another device. A USB sound card (DAC) or ground loop isolator may resolve issues.

Buzzing or Screeching Noises

Annoying coil whine.

Buzzing or screeching could be coil whine, a common issue with little recourse. It often occurs under load. Lowering graphics settings or using VSync might help with graphics card coil whine. Relocating power bricks can sometimes reduce noise. If it's not coil whine, check for fan vibration or the need for lubrication. All-in-one liquid cooling units might require pump speed adjustment.

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