What is PG-SIGNAL-FAIL?
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.
Common Causes
- Aging capacitors
- Defective circuit for voltage measurement in source
Step-by-Step Fix Guide
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1
Replace the source. Delaying the PG signal can destroy the board in the future.
Begin with Replace the source. Delaying the PG signal can destroy the board in the future.; it's the step that resolves PG-SIGNAL-FAIL for the largest share of reported cases.
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2
Measure the supply with a power tester
Repeat occurrences typically trace back to less obvious psu instability factors, addressed in the steps ahead.
Commands & Diagnostics
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Frequently Asked Questions
In most cases, aging capacitors is behind PG-SIGNAL-FAIL. Defective circuit for voltage measurement in source can trigger it too.
The fastest fix is "Replace the source. Delaying the PG signal can destroy the board in the future". Only move on to the later steps if PG-SIGNAL-FAIL keeps coming back.
PG-SIGNAL-FAIL is rated critical severity in our database. It's worth acting on quickly rather than letting it recur.
You shouldn't need to. Work through the guide above first — a reinstall is only worth considering if none of those steps help.
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