Power supply · critical

How to fix Power Good (PG) signal failure

Power supply troubleshooting guide

What this error means

The power supply failed to confirm to the motherboard in time that the voltage is stable, therefore the board will not start (POST). Another common trigger is aging capacitors.

Updated

Before you begin

Save open work and back up important files. Use instructions for your exact device and software version. If Windows cannot start, see the startup guide.

Work through these checks

0 of 2 complete
01Replace the source. Delaying the PG signal can destroy the board in the future.
  1. Replace the source. Delaying the PG signal can destroy the board in the future.
What to expect

Check whether the original symptom still occurs.

If it does not help

Continue only if this check applies to your device. Consult its manufacturer if you are unsure.

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02Measure the supply with a power tester
  1. Measure the supply with a power tester
What to expect

Check whether the original symptom still occurs.

If it does not help

Continue only if this check applies to your device. Consult its manufacturer if you are unsure.

Browse related errors

Possible causes

  • Aging capacitors
  • Defective circuit for voltage measurement in source