HP to Mac Studio display not working

[g1n9e]

I have been using a Mac Studio Display as a second screen with my HP laptop for three days. It sometimes needed to reconnect but as of today it has stopped displaying on the screen. Audio and microphone still connects. Every time I try to plug in the Studio screen I get a warning about recommending using an HP device to charge - my HP charging cable is plugged in already.

I have tried starting and restarting in multiple configurations, unplugging both machines, uninstalling the updates I installed yesterday on shut down (as that's a point before the change seemed to happen), uninstalling and reinstalling drivers, and many, many other updates from the HP website. At one point today after a restart it worked again, hours later.

The Mac Studio Display and cable is fine because it works with another laptop (7+ years old Chromebook) and the HP laptops/ports are fine because it works when I plug it into my TV. It's something about the connection between the Mac and HP.

Any help would be so appreciated, I'm sorry to say I let this take over much of my workday!

[Deep_World]

Hi  @g1n9e 
 
Welcome to the HP Support Community!

Thank you for reaching out, and I can certainly understand how important it is to have your external display working reliably, especially when it has been functioning intermittently and then suddenly stopped displaying video.

To better understand the situation, could you kindly confirm a few details?

• Are you using the built-in USB-C port on the HP ProBook 440 G10, or are you connecting through a dock/hub?
• When the display is connected, does Windows detect a second monitor under Settings > System > Display, even though there is no picture?

In the meantime, kindly try the below steps and confirm 

1. Disconnect the Apple Studio Display and shut down the notebook completely.
2. Power on the notebook and log in to Windows.
3. Connect the Studio Display directly to the notebook's USB-C port without using any adapters or docking stations.
4. Press Windows + P and select Extend.
5. Open Device Manager and expand: 
   • Display Adapters
   • Monitors
   • Universal Serial Bus Controllers
6. If you see any warning icons, kindly let us know.
7. Update the graphics driver and USB-C/Thunderbolt related drivers from HP Support for your specific model.
8. Check for BIOS updates using HP Support Assistant.
9. Open Settings > System > Display and click Detect to see if Windows recognizes the Studio Display.
10. If available, test with a different USB-C cable certified for video, even if the current cable works with another device.

Since audio and microphone functionality are still working through the Studio Display, the connection is being partially established. This can sometimes indicate a display connection, USB-C DisplayPort Alt Mode, graphics driver, or firmware-related communication issue between the notebook and the monitor.

I hope this helps. 

[g1n9e]

Hi, thank you so much for the suggestions. Unfortunately, none of these worked. Every time I try to plug the screen in I still get the message about using a recommended HP power source.

[Deep_World]

Hi @g1n9e,

Thank you for the update. I understand how concerning this must be.

Based on the information you've provided, this does not appear to be a hardware failure with either the display or the notebook. Since:

• The Studio Display works with another device.
• The HP notebook can output video to another display (your TV).
• Audio and microphone continue to work through the Studio Display.

The issue is most likely related to the USB-C DisplayPort Alt Mode communication, USB-C power negotiation, graphics driver, or BIOS/firmware interaction between the HP ProBook 440 G10 and the Studio Display.

Kindly try the simple steps : 

1. Update the BIOS to the latest version available for the HP ProBook 440 G10 using HP Support Assistant or HP Support - https://support.hp.com/ .
2. Install the latest Intel Graphics driver and USB-C/Thunderbolt-related drivers specifically for your notebook model from HP Support - https://support.hp.com/ .
3. Connect the Apple Studio Display directly to the notebook's USB-C port. Do not use adapters, hubs, or docks.
4. With the display connected, press Windows + Ctrl + Shift + B to reset the graphics driver.
5. Open Settings - System -Display and click Detect.
6. If the display is still not detected, perform a BIOS reset to default settings:  
   • Shut down the notebook.
   • Press F10 repeatedly at startup to enter BIOS.
   • Select Restore Defaults.
   • Save and Exit.
7. Test the connection again.

[g1n9e]

Hi thanks so much again.

I've eventually got this to work, tentatively. I basically disconnect and reconnect the monitor from either the laptop or the screen several times, in either order - screen first or laptop first - and eventually it seems to 'register', sometimes restarting in between. It's not ideal and I can't tell if it's going to stop working at some point as sometimes it takes many more tries.

Although I can't say what it is, I hope and assume some of your helpful fixes have worked in the background and I will certainly keep this list to refer to if there's another break. Thank you so much!

[Deep_World]

Hi @g1n9e,

Thank you for taking the time to come back and share an update. I'm glad to hear that you've been able to get the display working, even if the connection process is still somewhat inconsistent.

Based on what you've described, it does appear that the HP notebook and Apple Studio Display are able to communicate successfully, which is encouraging. The fact that reconnecting the cable multiple times eventually establishes the connection suggests there may be an intermittent connection, USB-C DisplayPort Alt Mode negotiation, or firmware compatibility issue rather than a complete hardware failure.

I appreciate you trying all of the recommended troubleshooting steps and your patience throughout the process. It's also possible that one or more of the updates or settings changes helped improve the communication between the devices.

For now, I recommend continuing to monitor the connection. If the issue becomes more frequent, or begins affecting productivity for in-depth diagnostics and review whether any additional firmware updates or hardware evaluation may be required, This may necessitate a one-on-one conversation to resolve the issue via remote assistance.