An external monitor that stays dark, flickers or shows the wrong resolution on the HP Pavilion Plus 14 is usually a cable, a port or a settings issue, since the laptop has USB-C ports with display output and an HDMI port on many configurations, and each has its own limits. First check which port you are using. A USB-C port carries video only if it supports DisplayPort, and the labels beside the ports and the HP specification list which ones do; a USB-C port that is for charging and data alone will not drive a monitor.
The checks in more detail
Use a cable rated for video, since a charge-only USB-C cable will not work, and check that the monitor is on the right input. Try the HDMI port if there is one, as that is the simplest route. Press Windows and P to choose the display mode: Duplicate, Extend or Second screen only. A monitor that is detected but black may be set to the wrong mode. Open Settings, System, Display and click Detect, then check the resolution and refresh rate the monitor supports;
a refresh rate or resolution too high for the cable can cause a blank or flickering screen, so lower it as a test. Restart the graphics driver with Windows, Control, Shift and B, and restart the laptop with the monitor connected. Update the graphics driver and the BIOS through HP Support Assistant, since display bugs are fixed there. If you use a dock or an adapter, test the monitor straight into the laptop, because docks add failure points and need their own drivers and firmware. Try another cable and another monitor to isolate the fault.
USB-C video can fail when the cable is long or low quality, so use a short, good cable. If the picture flickers, turn off variable refresh and adaptive brightness for a test, and check the monitor's own settings for its input and power-saving options. When the laptop shows the monitor in Display settings but it stays black, power the monitor off and on. If every port and cable fail with a known good monitor, run HP diagnostics and contact HP with the serial number, since a port or graphics fault may need repair.
Differential
Likely causes of “HP Pavilion Plus 14-ey external monitor is not detected or uses the wrong resolution”, and how to tell them apart
- 1
A USB-C port without display output
What separates it The monitor stays dark
How to confirm Use a port that supports video or the HDMI port
- 2
A charge-only or poor cable
What separates it No picture or flicker
How to confirm Use a video-rated cable
- 3
The wrong display mode or resolution
What separates it Detected but black
How to confirm Press Windows and P and lower the refresh rate
- 4
A dock or adapter fault
What separates it Works direct but not through the dock
How to confirm Test without the dock and update its firmware
- 5
An old graphics driver
What separates it Flicker or no signal
How to confirm Update the driver and BIOS
Before you touch a setting
Record this first — changing settings destroys the evidence
- Which port and cable
- The display mode
- The resolution and refresh rate
- Whether a dock is used
Try in this order
0 of 6 completedCheck the port supports video
ReversibleLabels and the specification.
Use a video-rated cable
ReversibleShort and good quality.
Press Windows and P
ReversibleChoose Extend or Duplicate.
Lower the resolution or refresh rate
ReversibleAs a test.
Restart the graphics driver
ReversibleWindows, Control, Shift, B.
Update the driver and BIOS
ReversibleThrough HP tools.
Model-specific
What is true of this model and not of its siblings
- Port labels
- Not all USB-C ports carry video.
- Cable
- A charge-only cable will not work.
Stop boundary
When this stops being a self-service repair
- !If every port and cable fail with a known good monitor, contact HP with the serial number
- !Update the driver and BIOS first
- !Try another monitor
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Why is my external monitor black?+
The port, cable or display mode.
Do all USB-C ports output video?+
No.
What does Windows and P do?+
It chooses the display mode.
Should I test without the dock?+
Yes.