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Hey,
I have installed Windows 10 on my MacBook Pro Retina Mid 2012. I'm using 2 external Displays, but the Thunderbolt Display show's only a black screen. All ports (USB, FW, Ethernet) on that Display work fine. I have updated all software.
MacBook Pro (Retina, Mid 2012), Windows 10, Thunderbolt Display
I did not have an exact environment for testing. The test used a late 2013 15-in rMBP, Apple TB Monitor and a Dell U2717 via HDMI running Windows 7. Windows 10 should also work with this setup. The difference in GPUs (GT650m - MacBook Pro (Retina, 15-inch, Mid 2012) - Technical Specifications vs GT750m - MacBook Pro (Retina, 15-inch, Late 2013) - Technical Specifications ) should not be causing such behavior.
1. TB Monitor connected and automatic drivers installation.
2. After W7 Reboot, no HDMI connection yet.
3. First HDMI Connection prompted restart.
4. After Restart.
5. Monitor identification.
Disconnect the LG, run the following procedure
Reset the System Management Controller (SMC) on your Mac - Apple Support
and boot into Windows with the TB display connected and test?
Do you have any unknown devices in Windows Device Manager?
Before you make the effort to re-install W10, we can check a few more possible areas.
Was W10 and upgrade from W7/W8.1?
Are you duplicating displays or extending displays?
If only the TB monitor is connected, under Monitors, what are the entries in Device Manager?
Have you tried to update BC6 drivers, using either Apple Software Update or using BC Assistant-created drivers USB?
W10 was not an upgrade.
I'm extending my displays.
The TB Display won't show in the Device Manager.
I updated the BC6 Drivers with the BC Assistant and Apple Software Update say's everything is up-to-date.
Does the FaceTime Camera from the TB display show up in the Device Manager? Can you try both TB ports and reboot for each to check the ports in W10? Are you using an external Thunderbolt hub or a direct connection to the Mac/Windows?
Everything on the TB Display (all USB Ports, FireWire, Facetime Cam, Ethernet) run's but it stay's black. The Display is connected directly to the Mac.
Right now the TB Display is only a huge TB Hub.
Does the FaceTime camera turn on? If yes, then you have the TB monitor brightness turned down to zero under W10. Can you increase the brightness and test? The other check would be the color should be a lighter black (back-lit) not pitch-black (powered-off).
Let me check this in the morning at my desk. There are a couple of settings (Brightness adjustments) that I want to check. What is the version of the nVidia driver that you currently have installed on the Windows side?
That didn't help either.
I plugged everything out of the Mac and the Display, but it still show's no image.
Everything is fine in my Device Manager, there are no unknown devices.
The FaceTime Camera turn's on, but the Display is still pitch-black.
As you can see in the screenshot below, there is only 1 Display.
I tried in installed W10 again, but it still won't work.
If it works properly on the OSX side, it should work on the W7 side as well. Can you boot into OSX side, and post the output similar to the following?
On MacOS everything work's fine.
The driver version you have seems to be incorrect. This is what I get from the nVidia Support website.
The nVidia Software show's the right driver.
Thunderbolt Display Windows 10 Boot Camp
