Self HelpBoise Computer Care

Desktop & PC hardware

Power supply warning signs

Signs your PC power supply is failing: shutdowns under load, buzzing, burning smells, and undersized wattage, plus when to stop using it.

Difficulty
Medium
Time
10 min to assess
Steps
5
Updated

Sounds like this?

  • PC shuts off under load
  • Random restarts during games
  • Buzzing or whining from the PSU
  • Burning smell
  • PC won't power on

Step by step

  1. Note when shutdowns happen. Shutting off only under heavy load (gaming, rendering) points to the PSU or overheating.
  2. Check the label on the PSU for its wattage and compare it to your graphics card maker's recommended PSU size.
  3. Make sure all power connectors (24-pin, CPU 8-pin, GPU 8-pin/16-pin) are fully seated.
  4. Plug the PC directly into a wall outlet or a good surge protector, not a cheap power strip.
  5. Check temps to rule out overheating.

Related error codes & messages

Quick answers

When should I stop and get professional help with "Power supply warning signs"?

Stop and get help if: Any burning smell, smoke, popping, or loud buzzing. The PSU is undersized for a new graphics card. A 16-pin (12VHPWR/12V-2x6) GPU connector looks melted or discolored. Stop using the PC. Boise Computer Care can diagnose it for a $60 fee; call 208-996-3508.

How long does this fix take and how hard is it?

Plan on 10 min to assess. Difficulty: Medium.

Is it safe to try this myself?

Mostly, if you follow these precautions: Never open a power supply. Capacitors inside can hold a dangerous charge. Unplug immediately if you smell burning or see smoke.

Which error messages or codes does this guide cover?

Kernel-Power 41, Unexpected shutdown.

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