Laptop External Monitor "Flickering" (Blacking out)
4.5
The second monitor randomly goes black for a second and then comes back.
Symptoms
- Intermittent blackout
- Flickering
- Static
Possible Causes
- Bad HDMI/DP cable
- Insufficient power to dock
- Refresh rate mismatch
Step-by-Step Fix
1
Try a Different Cable
90% of flickering issues are caused by a low-quality or damaged cable.
2
Lower Refresh Rate
If running 4K at 60Hz, try 30Hz to see if the flickering stops.
3
Plug Dock into Power
If using a USB-C dock, ensure it has its own power supply connected.
When to See a Technician
High-resolution signals are very sensitive to cable quality and electrical interference.
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