Boot Camp Issue: W10 keeps asking to Reinstall

Note: network cable is not attached. I only have a USB Cable for Keyboard and USB Cable for Thrustmaster Wheel attached.

When booted into macOS, see previous post, I get black Windows screen with the blue Windows logo, and boom, back to macOS...

Next I turn of macOS, wait 15 seconds turn on macOS and hold Option key. Boot into Windows, black screen/blue window logo/screen goes dark for a second, spinning balls which freeze, and starts macOS....

Next, do an SMC, boot into Windows... screen with the option I shared above...

Picked: Startup Repair > Black screen/Windows logo: Diagnosing PC. Result: Startup Repair couldn't repair your PC.

Press "Advanced Options" to try other options to repair your pc or Shut down. Log file: C:\Windows\System32\Logfiles\StrTrail.txt > Picked Advanced Options

Selected Restore from Previous version. Picked the most recent one in the list which was when I installed Thrustmaster Drivers for Wheel.

Restore succesful > Asked to restart Windows > Restarts in MacOS > Before I log into macOS, I opt to restart and pick Windows after holding Option Key.

This time Windows starts, I can log in get a black screen, and after a while I get a working W10.!!!

So.. If I do a SMC, select Advanced Option and pick a restore point, it works. But that can't be right I assume. ;)

Some other pointers:

I have selected macOS as the default startup "boot"

Hope the above helps to get an idea what is going on...

Hi Loner T,

1:

Did the SMC procedure, and when starting the Mac after the SMC, the NVRAM, and Windows started like nothing ever happened. Let Windows run for around 5 minutes (during which I saw some flashes of a 'Terminal like' screen.

2:

Next, I tried to reboot into macOS via the little Boot Camp icon in the task bar, but Boot Camp Control Panel does not show macOS (see attached). So I opted to shut down Windows via the regular Start Menu.

3:

Noticing that after shut down and startup it boots into Windows (assumed it reset the Boot Order (macOS first) I set previously)

Again, boots up Windows without an issue.

Shut down Windows vis Start Menu

4:

Start up macOS by holding Option Key after I turn iMac on. No Error messages.

5:

Shut down macOS

6:

Start up Windows 10 by holding Option Key.

Starts Windows 10 without any issues.

So it seems the CMS+NVRAM fixed the issue?

Could you explain in layman terms what fixed the issue?

Next test:

1: Set the Boot Order to macOS first

2: Shut down iMac

3: Start iMac (not holding Option Key). > macOS boots

4: Shut down iMac

5: Start iMac with Option key to start in Windows 10

6: Windows 10 starts perfectly!

The only thing that is not working is the reboot into macOS from Boot Camp icon in the task bar.

It tells me it can't find the macOS XYZ... (missed the message)

Next I will test with adding the USB Cable for the steering wheel and a USB C to Mini-Display Port cable to use my old 27" iMac as a 2nd screen.

Would love to understand what cause the issue in your opinion.

How can I thank you Loner T?

Hi Loner T,

Did that followed by:

1: Completely shutting down the iMac

2: Starting by holding Option Key and boot into W10.

Result:

1: Blue Windows logo

2; Spinning wheel/balls

3: Blue Windows logo disappearing

4: Spinning wheel freezing

5: macOS starting itself after I would say 2 minutes.

Next:

1: Started macOS till I get to the regular macOS login screen

2: Click on the Restart option at the bottom

3: Similar to above

4: Error message after it automatically rebooted to macOS

Error messages:

Hi Loner....

I previously removed the Boot Camp partition through Disk Utility but upon reading I should have used the Boot Camp Assistant to do so. Could that first Disk Utility removal caused (some of) the issue(s)?

I will remove the W10 partition via the Boot Camp Assistant and start from scratch. Do I understand that I should turn off auto-updates on Windows?

UPDATE: Got attached error when I tried to use the Boot Camp Assistant.

If I open Disk Utility, the partition is gone:

Should I do anything to make sure the next Boot Camp Installation is 'clean' because of the above error?

I would like to thank you for you swift responses.

Hi Loner T,

i started from scratch and was able to play the game for a solid hour. Just tried again by rebooting into W10 by holding the Option key and pick Windows 10 and after two failed tries, macOS started the macOS by itself, it finally started W10 with an error message. Something with an unhappy smiley face and an error code with “Stop” in it. Automatically booted back into macOS... so loopdieloop.

Made sure NO harddrives or even USB Cables, besides Keyboard are attached, to the iMac...

just tried again and not even getting into W10 screens.

If I login to macOS, it get attached error message:

I used the 1803 version by the way.

When booted into macOS, see previous post, I get black Windows screen with the blue Windows logo, and boom, back to macOS...

Next I turn of macOS, wait 15 seconds turn on macOS and hold Option key. Boot into Windows, black screen/blue window logo/screen goes dark for a second, spinning balls which freeze, and starts macOS....

Does this help?

Nope. No errors.

I have no issue to fully reinstall windows 10. But I would love some advice on how to completely re-install the present Boot Camp partition and start fresh.