No Bootable Device after attempting to reinstall Windows.

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Hello,

About a year ago I decided to install W10 on my mid-2012 spec'd MBP for application support, etc. Recently I decided to do erase the partition and do a clean install. After backing up my files, and running through the regular Bootcamp prompts with a 16gb Intense USB3.0 drive, the computer restarted and gave me a "No bootable device -- insert boot disk and press any key" error. I restarted hitting the alt key and made sure the drive was being detected as bootable, which it was, and then tried again. Same thing. Attempting to run it via EFI brings up the setup screen, but then doesn't let me select the partition because the drive is formatted as MBR.

Again, I am reinstalling W10 with the same iso with a different thumb drive, but I don't see how that could be causing a problem considering they were both 3.0.

Any help would be much appreciated.
Cheers, John.
 

chscag

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Welcome to our forums.

Did you remove the Windows 10 partition using the Boot Camp Assistant? It sounds like you didn't? Erasing the Boot Camp partition containing Windows 10 using Disk Utility or any method other than the Boot Camp Assistant will cause problems in that the space will not be properly returned to macOS so that you can reinstall Windows 10.

Let us know exactly what you did and we can advise on how to proceed from there. Also we are assuming you can boot to macOS ok?
 
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Yes, sorry for not making that clear, I used BCA to erase the partition. Yes I can boot to macOS.
 
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chscag

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OK, that means that your Macintosh HD should be one partition again not counting the EFI and Recovery partitions. Have you gone through the Boot Camp setup again to create another partition for Windows 10? If that's done correctly, then you should have no difficulty reinstalling Windows 10.

Another question for you: Does your mid 2012 MacBook Pro have an optical drive? The reason we ask is that there were several models for that year; one standard, the other retina without an optical drive. If your 2012 has an optical drive, Boot Camp is looking for the Windows ISO to be on disk and the disk inserted in the drive.
 
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Yes -- it has an optical drive. I know that it could default and look for a disc, but I've installed W10 without issues before and I'm not sure why I can't do it again.
The HDD was one partition when I went through the Bootcamp process; drivers were downloaded and partition created all through BCA, then the computer restarted and I got the error.
 
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Go into Disk Utility and ensure the former partition has been returned to the one single partition, apart from Recovery depending what operati ng system you are using which you have not told us.
 
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Not sure what you meant by which operating system I am using but I'm trying to install W10 and I'm currently running macOS. As of now the HDD is one single partition which is macOS.
 

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Hi John

Not sure what you meant by which operating system I am using

We are trying to determine which Mac Operating System you are running - for example macOS High Sierra, Sierra, El Capitan, Yosemite etc.

If you're not sure, click on the Apple icon , top left Menu Bar and, from the drop down, select "About This Mac".

Ian
 

chscag

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After backing up my files, and running through the regular Bootcamp prompts with a 16gb Intense USB3.0 drive, the computer restarted and gave me a "No bootable device -- insert boot disk and press any key" error.

That error indicates the installation is looking for the Windows 10 ISO to be located in the optical drive. Since your Mid 2012 MacBook Pro has an optical drive, you're getting that error. I know you stated you were able to install it from USB before. What did you do before that the installation was successful and now it is not? What has changed since then?
 
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I'm running OS X El Capitan (10.11.4)

That's the thing I'm confused about. I'm pretty sure I did nothing different and had no issues last time around, and I haven't updated anything since then for that matter. The only difference I can think of is maybe the flash drive? The one I'm trying to use it with is an Intense 16gb, while the other one was a Kingston 8gb. If this is the issue, are their any workarounds?

Thanks for your help.
 
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UPDATE: After doing a little bit of reading on various forums and guides I came across a tool called GPT fdisk which allowed me to (after booting into recovery mode and disabling SIP), convert from Hybrid-MBR to purely GPT. I then rebooted into EFI Boot and the installation ran flawlessly. The computer restarted, and thats when I hit the next issue: Windows gives me a BSOD with the error "System thread exception not handled: igdkmd64.sys." At wits end, I googled the issue to come to the conclusion that this is an IntelHD graphics driver error. A person on Apple's community forums had given a workaround for this, by removing anything related to the driver on the USB created by BCA. This forces the Windows Installer to revert to a generic display driver, which seems to work well for the time being (Let me fully finish the installation process).

The issue now is that since I ran in EFI mode instead of MBR/BIOS, the Cirrus audio driver does not seem to be exposed properly, so I'm left with no audio.
Any suggestions would be great!
 

chscag

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How about burning your Windows 10 ISO to a CD or DVD and start over that way? Boot Camp will download the proper drivers for you which you can install by using that flash drive.

Sorry, but I really don't have any other suggestion. I suppose you could always use virtual software to install Windows 10 but I believe that's not what you want to do.
 

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