Graphics · medium

How to fix DisplayPort - signal loss or image flickering

Error code: DISPLAYPORT-NO-SYNC

What this error means

Monitor connected via DisplayPort randomly flickers, dims, or loses sync. It's also often linked to poor quality or too long DP cable (>1.8m without active converter).

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 3 complete
01Replace the cable with a certified DP cable
  1. Replace the cable with a certified DP cable
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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02Lower the refresh rate in Display Manager
  1. Lower the refresh rate in Display Manager
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
03Turn off G-Sync/FreeSync as a test
  1. Turn off G-Sync/FreeSync as a test
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

  • Poor quality or too long DP cable (>1.8m without active converter)
  • Monitor frequency set above cable limit (DP 1.2 vs DP 1.4)
  • DisplayPort 1.4 disabled in GPU BIOS

Useful Windows tools

These commands open Windows tools. Review changes before applying them.

dxdiag