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bishu shah 0 Newbie Poster

during starting computer smps sounds more .after starting windows it automatically stops sound. what is the reason behind it?

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Dani AI

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A short expert note for : an audible change from the power supply only during boot that quiets after the OS loads is usually caused by transient behavior at startup (fan spin‑up, drive spin‑up, inrush charging) or by switching/inductor vibration that only occurs under that specific load profile. These behaviors are common with switched‑mode power supplies; for background see Switched‑mode power supply and a practical PSU overview at How Power Supplies Work.

Try this quick diagnostic sequence to isolate the source and severity:

  1. With the case open, power on briefly and listen to confirm the noise actually comes from the PSU (use a folded paper tube as a non‑conductive stethoscope).
  2. Boot into BIOS/UEFI (stop before Windows loads) — if the noise is gone already, the cause may be drive activity or a driver/power‑state change.
  3. Disconnect nonessential drives and peripherals, then test booting again to see if the sound reappears.
  4. Check for loose screws, cables touching fan blades, or a fan that chirps only while starting.
  5. If the sound is a high‑pitched whine (coil whine) rather than mechanical rubbing, try the system with a different PSU or have the PSU RMA tested.

Safety and next steps: do not open the PSU (dangerous stored voltages). If the sound is mechanical (fan or loose parts), cleaning/replacing the fan or reseating hardware often fixes it. If it is persistent coil whine but the system is stable, it is annoying but not immediately dangerous; for reliability and peace of mind, replace the PSU if you detect instability, smells, overheating, or if the unit is old.

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