In a pickle, got OpenCore installed finally but now my Windows 10 will not boot. Black screen.

[thewalrusking]

During log in I let my PC boot into Windows but all I get is a black screen, Windows won't load even the blue windows icon. I can get into Catalina by choosing boot menu during POST and picking it's hard drive.

 

I only looked into dual booting after I got the OC installed and working. I used the latest OC Vanilla guide and latest options on OC and Catalina. Now I realize my mistake, that OC tends to inject data to boot that effects Windows as well.

So, my data on my C drive is secure. I saved it from my Catalina log in. I was going to reinstall Windows eventually anyway, I do it once every 6months or so. So no biggie about missing Windows today but I want to get this back to being a dual boot or at worst just back to Windows.

 

Is it possible now to reinstall Windows 10 and yet keep OC and Windows separate? If not I'll have to just ditch OC as I use Windows far more and was doing this mostly cause I was bored. Though I do like how nice MacOS is.

[teflon]

I was in a similar spot the last few days, and it depends a bit on your set up.

 

If you've got separate drives for OSX and Windows, you should be able to use your motherboard's boot menu to select the Windows drive with its own EFI boot set up. That'll bypass Opencore. 

 

If you've got a single drive or want a more integrated solution, I've settled on is to use the OpenCore-NDK branch pinned in this forum. It doesn't passthrough ACPI tweaks to Windows by default, adds a fancier UI bootpicker, and some other things. You'll need Xcode to compile it yourself, and then to either re-do the config.plist from scratch or add the relevant strings, but if you've come this far, there's only a handful of areas that are different.

[moozuki]

I use separate drives fro macOS and Windows, don't boot windows with opencore I just use bios boot menu ( f11 for my asrock board).

If you need to re-install windows suggest you remove mac drive first. Once windows is up and running re-install drive and use bios to choose which to boot. Mine defaults to windows as I use it more these days.

 

[thewalrusking]

Awesome, so I can easily reinstall I'll try that. Maybe that'll fix it right there. Thanks. And yes it was on separate drives.

[teflon]

Since you're already on separate drives, you shouldn't need to reinstall Windows to use your motherboard boot menu. Just... try it as is!

 

Reinstalling Windows also won't change booting to Windows via OpenCore. That will still inject Mac-like parameters to the OS unless you switch to the NDK fork, or modify SSDT and DSDT files to ignore all but OSX.