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5,1 - Cant install Bootcamp with Flashed 1080 Ti

JDLang76

JDLang76

macrumors regular
Original poster
Jan 1, 2018
155
57
I keep getting as far as the OS booting and installing graphics driver.
Then when restarted, nothing. Freezes on windows logo or just black screen.
There is no APFS drive in the system and Ive tried it with and without my PCI-E RAID array for OS X.

I have tried....
Installing windows 7 by disc
--updating to 10 with no drivers
--updating to 10 with boot camp drivers
--updating to 10 with only manually installed 1080 ti driver (7 also freezes after this)
Installing Windows 10 by usb
--installing bootcamp drivers
--not installing boot camp drivers
--letting windows 10 install graphics driver
--manually installing graphics driver
Resetting PRAM before each boot.

I just keep getting stuck on boot.
Using an internal SATA 3.5" SSD
Not using Bootcamp. Just installing on clean drive.

Help???
 
USB installer defaults to installing in UEFI mode
CD installer defaults to installing in CSM/Legacy BIOS mode, which is the "correct" (as in, that's what Apple designed) way to run Windows on the Mac Pro.
 
bookemdano said:
USB installer defaults to installing in UEFI mode
CD installer defaults to installing in CSM/Legacy BIOS mode, which is the "correct" (as in, that's what Apple designed) way to run Windows on the Mac Pro.
Click to expand...

Weird. I didnt have this problem with a non-flashed 1080.
Thanks!
 
bookemdano said:
USB installer defaults to installing in UEFI mode
CD installer defaults to installing in CSM/Legacy BIOS mode, which is the "correct" (as in, that's what Apple designed) way to run Windows on the Mac Pro.
Click to expand...

That did not work. As soon as screen flashed for driver install, it never came back. Anything else?
 
Try NOT using Bootcamp - as a test try installing Win 7 to it's own HDD using the Win 7 CD assuming that you have a spare EFI flashed GPU.

Then you can use the Option Key Bootpicker to select the Win 7 CD to install.

Works for me.

NOTE : If you make a 'signature' in your Macrumors profile we won't have to 'guess' your mac Pro setup.

eg : my Mac Pro 'signature' is below THIS text t the bottom of this post
 
MIKX said:
Try NOT using Bootcamp - as a test try installing Win 7 to it's own HDD using the Win 7 CD assuming that you have a spare EFI flashed GPU.

Then you can use the Option Key Bootpicker to select the Win 7 CD to install.

Works for me.

NOTE : If you make a 'signature' in your Macrumors profile we won't have to 'guess' your mac Pro setup.

eg : my Mac Pro 'signature' is below THIS text t the bottom of this post
Click to expand...

I never use bootcamp. I always install clean onto hdd.
 
JDLang76 said:
That did not work. As soon as screen flashed for driver install, it never came back. Anything else?
Click to expand...

Did you hold Option at boot? When you do that make sure you choose the CD icon called Windows and NOT the one called EFI Boot.

If it still doesn't work, do you have another GPU you can install temporarily?
 
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bookemdano said:
Did you hold Option at boot? When you do that make sure you choose the CD icon called Windows and NOT the one called EFI Boot.
bookemdano

If it still doesn't work, do you have another GPU you can install temporarily?
Click to expand...
Yes ! I forgot to mention that " not the EFI boot " ! Thanks for reminding me.
 
bookemdano said:
Did you hold Option at boot? When you do that make sure you choose the CD icon called Windows and NOT the one called EFI Boot.

If it still doesn't work, do you have another GPU you can install temporarily?
Click to expand...

Sorry if I didnt clarify. I inserted the Windows 10 disc while inside Windows 7. But I guess that might have messed the setting up too. Im going to try CD as fresh install now.
 
JDLang76 said:
Just tried that. Same result. Graphics drivers killed display
Click to expand...
Stupid question, do you have a 120GT installed? When Windows 10 installs the driver for 120GT it uses the 9500GT driver and that makes the screen go-off.
 
tsialex said:
Stupid question, do you have a 120GT installed? When Windows 10 installs the driver for 120GT it uses the 9500GT driver and that makes the screen go-off.
Click to expand...

The only GPU installed is the flashed 1080 ti
 
Have you tried all the outputs on the 1080Ti? And make sure you've only got one monitor connected.

Do you have another GPU you can install temporarily to do the install? Can be just about anything since Windows has drivers for most cards. You won't have boot screens so you will need to hold down the "C" key on your keyboard (and preferably remove all other HDDs/SDDs except your Windows disk) to boot from the DVD.

After Win10 is installed and working, then power down and install the 1080Ti but don't remove your other GPU (and don't connect your monitor to the 1080Ti). Boot back up and run Windows Update to get the proper driver for the 1080Ti (or maybe try going directly to Nvidia's web site and download and install their latest driver). Once you've verified the driver is installed, shut down again and pull out the other GPU, leaving the 1080Ti as the only one, and plug your monitor to it.

Hopefully that gives you some more things to try.
 
bookemdano said:
Have you tried all the outputs on the 1080Ti? And make sure you've only got one monitor connected.

Do you have another GPU you can install temporarily to do the install? Can be just about anything since Windows has drivers for most cards. You won't have boot screens so you will need to hold down the "C" key on your keyboard (and preferably remove all other HDDs/SDDs except your Windows disk) to boot from the DVD.

After Win10 is installed and working, then power down and install the 1080Ti but don't remove your other GPU (and don't connect your monitor to the 1080Ti). Boot back up and run Windows Update to get the proper driver for the 1080Ti (or maybe try going directly to Nvidia's web site and download and install their latest driver). Once you've verified the driver is installed, shut down again and pull out the other GPU, leaving the 1080Ti as the only one, and plug your monitor to it.

Hopefully that gives you some more things to try.
Click to expand...

Tried ports/monitor. Cant try gpu thing because after a restart, the system freezes after selecting Windows as the startup disk in the boot menu
 
JDLang76 said:
Tried ports/monitor. Cant try gpu thing because after a restart, the system freezes after selecting Windows as the startup disk in the boot menu
Click to expand...

Can you clarify what you're talking about there? Maybe it's freezing due to your 1080, and wouldn't freeze if you swapped in a different GPU.

Have you attempted a fresh install of Win 10 (onto a blank SSD/HDD installed into one of the SATA bays) rather than trying to upgrade Win7?
 
bookemdano said:
Can you clarify what you're talking about there? Maybe it's freezing due to your 1080, and wouldn't freeze if you swapped in a different GPU.

Have you attempted a fresh install of Win 10 (onto a blank SSD/HDD installed into one of the SATA bays) rather than trying to upgrade Win7?
Click to expand...

Yes multiple times. Ive tried every combination possible for installation. Please read original post.

When i restart, the boot menu appears, i have 2 options. Osx and Windows. I click enter on windows. Before the screen changes, it freezes.

Just made a progress with yet another port config. Used first displayport only. Drive installed. Screen worked. Restart worked. Turned computer off, got passed windows logo, then no display.

EDIT - Switched to HDMI only. Working. Now I think Ive narrowed down its a problem with the ports.
 
I read your original post, I guess maybe I wasn't clear in what I'm suggesting you do. So I'll spell it out in detail.

1. Pull out all of your existing drives and PCIe cards. That includes RAID arrays, macOS drives, NVMe blades, everything. All PCIe cards including your 1080Ti, USB cards, m.2 adapters, everything.
2. Install a blank SSD or HDD in one of your drive bays
3. Install some other GPU other than your 1080Ti. Preferably something without an EFI ROM.
4. Insert your Win10 DVD and boot the cMP holding down the C key on the keyboard as soon as you hear the chime. You will not see any boot screens (and therefore you cannot and should not be holding down the Option key), but the C key will instruct the Mac to boot from the DVD.
5. Install Win10 onto the blank HDD/SDD you installed in step 2.
6. A suitable driver for your GPU should be installed after the first boot, so give it plenty of time to do so. Reboot a few times afterwards for good measure to make sure that everything is working properly.
7. Assuming everything is good, shut down the cMP and install the 1080 in one of the other PCIe slots, but do not connect your monitor to it. Leave the monitor connected to your other GPU (which should still be installed). Boot back up.
8. Since your Win10 drive is the only drive installed, the Mac should boot from it without you needing to hold down any key modifiers. Let it boot up. I suggest that rather than letting Windows Update install its driver for your 1080Ti that you go to nvidia's web site and manually download their latest driver package and manually install it. Verify in Device Manager that the driver is installed. Reboot a few times for good measure.
9. Assuming everything is still good, shut down and remove your other GPU, leaving the 1080Ti as your only installed card. Connect your monitor to it, boot up (no need to hold down any keys since Win10 is the only drive installed) and cross your fingers.
10. If it works, then reboot a few more times to make sure. Then power down and re-install all the stuff you previously removed (macOS drive(s), any other PCI cards, etc.)--preferably one at a time in case it turns out one of those things was causing the no boot/black screen issue.

If it still doesn't work at Step 10 then you may want to try installing older driver packages for the 1080 in case it's an incompatibility with the newest drivers.

If no go there, then you may be SOL.

Good luck.
 
Figured it out. Displayport #2 is preventing windows from booting. Switched to HDMI only for Windows and driver install then added Displayport #1 and its working. (If i added DP1 any earlier it didnt work)

Problem solved.

EDIT-2 restarts later, same problem. This is so weird. Turns out I can only consistently boot with NO DP port used. Once im in windows, i can plug into any DP port and its picked up right away. So o just have to unplug DP for a min when switching to windows. Stupid. But i can live with it
 
Last edited:
MVC cards are weird with outputs--that's why I suggested earlier that you test all of the card's outputs (and with only one monitor connected). I have an MVC-flashed 750Ti that refuses to boot with any two outputs connected (but works fine with 2+ monitors after the OS is booted). The stock card never had that problem--only after I sent it to MVC for flashing.

Glad you're up and going.
 
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I’m using hdmi all I’m getting is black screen with just the mouse. My gpu is gtx 680. Any ideas ?
 
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