Error Code Screen is blank or video is flashing

The screen is blank or displaying a flashing video signal.

? What Causes This

Power cord disconnected, power button off, improperly connected video cable, system in sleep mode, or incorrect refresh rate/resolution setting.

✓ How to Fix It

Check and reconnect the power cord. Ensure proper connections for other cables like display input. Adjust video settings as necessary (like disabling auto-switch source).

Source: page 69 of the official manual

From the manual

Manual page 69 — HP error Screen is blank or video is flashing

This error code appears in:

HP Z27 27 Inch 4K Uhd Display