Power Good (PG) signal failure

What is PG-SIGNAL-FAIL?

The PG-SIGNAL-FAIL error is categorized as a critical-severity power supply unit (PSU) issue that can significantly impact your PC's stability. The power supply failed to confirm to the motherboard in time that the voltage is stable, therefore the board will not start (POST). When experiencing the Power Good (PG) signal failure fault, users often report sudden system crashes, unresponsive behavior, or a blue screen of death (BSOD). In most diagnostic scenarios, this problem is directly triggered by underlying hardware or software complications such as aging capacitors and defective circuit for voltage measurement in source. To permanently resolve the PG-SIGNAL-FAIL issue and prevent further system degradation, it is highly recommended to follow our step-by-step troubleshooting guide below, ensuring your power supply unit (PSU) components are functioning correctly.

Common Causes

• Aging capacitors
• Defective circuit for voltage measurement in source

Step-by-Step Fix Guide

• 1
  Replace the source. Delaying the PG signal can destroy the board in the future.

  Applying the first fix (Replace the source. Delaying the PG signal can destroy the board in the future.) addresses the most common root cause of PG-SIGNAL-FAIL and restores baseline functionality.

• 2
  Measure the supply with a power tester

  If the problem persists, proceeding with the remaining steps ensures all edge cases related to psu instability are covered.

Commands & Diagnostics