Power supply · critical

How to fixPG-SIGNAL-FAIL

Power Good (PG) signal failure

What this error means

PG-SIGNAL-FAIL shows up as a critical-severity power supply unit (PSU) fault. 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. See the troubleshooting steps below for the fix.

Before you begin

Save open work and back up important files. Note any recent driver or hardware changes. If Windows cannot start, use the startup guide first.

Work through these checks

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

Replace the source. Delaying the PG signal can destroy the board in the future..

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

I need help
02Measure the supply with a power tester

Measure the supply with a power tester.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

I need help

Possible causes

  • Aging capacitors
  • Defective circuit for voltage measurement in source