HP ENGAGE 14 FHD DISPLAY + FLEX IO issue?

[SuNsHaDoW]

Hello!

I recently bought a Pro Mini G9 with flex IO typeC board to connect it to my ENGAGE 14 FHD monitor but, when i connect the display on the typec of the flex board, windows show it few seconds and after disappear.

What am i doing wrong?

I have this flex io board

WhatsApp Image 2026-08-20 at 18.44.20.jpeg

[Deep_World]

Hi  @SuNsHaDoW,
 
Welcome to the HP Support Community!

Thank you for reaching out, and congratulations on your new HP Pro Mini 400 G9. I understand that you are trying to connect your HP ENGAGE 14 FHD monitor through the Flex IO USB-C port, but the display appears briefly and then disconnects. I'll be glad to help you with this.

To better assist you, could you kindly share the following details?

• Are you connecting the monitor directly with a USB-C cable, or are you using an adapter/docking station?
• Does the monitor remain powered on when the display disappears?
• Have you tested the monitor with another system or another USB-C cable?
• Are there any error messages shown in Windows when the monitor disconnects?
• Does the monitor work correctly when connected through HDMI or DisplayPort (if available)?

From the image provided, the Flex IO module appears to be a USB Type-C SuperSpeed port. Depending on the specific Flex IO configuration installed in your Pro Mini, the USB-C port may provide data connectivity only, or it may support DisplayPort Alternate Mode for video output. 
 

In the meantime, kindly try the below steps and confirm : 

1. Update the system BIOS to the latest available version for your HP Pro Mini 400 G9.
2. Install the latest Intel graphics driver and chipset driver from HP Support https://support.hp.com/ .
3. Open Device Manager and check for any warnings under: 
   • Display adapters
   • Universal Serial Bus controllers
   • Monitors
4. Verify that the USB-C cable supports video transmission (DisplayPort Alt Mode). Some USB-C cables support charging and data only.
5. Connect the monitor after Windows has fully loaded and observe whether it remains detected in Settings > System > Display.

I hope this helps. 

[SuNsHaDoW]

Hello @Deep_Workd! Thanks for your reply.

The display does not turn on. I think the issue may be related to the power output of the USB-C Flex IO port.

The monitor requires 27W (9V / 3A), and I cannot understand whether this port is capable of providing that amount of power.

I am, of course, connecting the monitor using the original HP cable provided with the monitor.

I am not using a docking station.

The monitor never powers on.

When I connect it, I can hear the typical "new hardware connected" sound in Windows, and after 2–3 seconds I hear the "hardware disconnected" sound. I can see the monitor listed in the hardware panel for approximately 3 seconds before it disappears.

I also tried powering the monitor with a large battery pack, and it works correctly (although there is no video signal).

I tested the Flex IO port with a USB hub (Ethernet, HDMI, and USB ports), and the HDMI output works correctly. This makes me think that the Flex IO port supports DisplayPort.

So, the main question is:

Can the USB-C Flex IO port provide a 9V / 3A (27W) power output to the monitor?

If not, is there another setting, adapter, or configuration required to provide enough power to the monitor?

Thank you.