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Black screen after Windows 10 Install on iMac

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Hi, I have got 0 experience with Mac firmware and have no idea how to fix this.

My iMac is a late-2011 model (21.5”) and is on High Sierra (10.3.6).

 

I chose to install Windows with Brigadier rather than Bootcamp because Bootcamp would not recognize my boot drive for some reason.

I created a partition for Windows and installed the OS, all went well until it finished installing and booted, but into a black screen.

The screen was on and when I moved the mouse, the Windows cursor would show up but its position would reset to the center every two seconds.

I assume it’s some crucial drivers that aren’t installed, but I’ve acquired the correct ones (iMac12,1) and only the ones from Intel can be detected and installed (through the installation interface).

I am completely lost here. How am I supposed to proceed??

 

Thanks in advance.

Main setup: Republic of Gaymers G531GT, Logitech G305, Apple 3.5mm Earpods, Kworld MP90 90x40cm cloth pad, external SATA optical drive

 

Main G531GT: i7-9750H (forced 55W boost), GTX 1650M (TU117 1024C, 4GD5, +150c +700d5),  2x8GB 2666MHz (Samsung/TeamGroup), Micron NVMe 512GB Gen 3 (Win10 21H2), Seagate Barracuda 1TB SATA HDD, 1920x1080@158Hz IPS panel, tons of additional copper on bottom cover

 

Alt1, server: i5-4590, OEM stock aluminium cooler, Gigabyte B85M-D3H, Asus DirectCU II GTX 650Ti (or MSI R9 280 Gaming), 4x4GB 1600MHz (Kingston Fury Red 1600MHz x2, Panram Lightsaber 2800MHz x2), Samsung 860 Evo 512GB SATA (Win10 21H2), 160GB shared HDD, AOC 210S 1680x1050@60Hz D-sub monitor, all inside an Acer office PC case with decent airflow, brutally modded to fit long cards and avoid sagging

 

Alt2, iMac 21.5" (late 2011): i5-2400S, Radeon HD 6750M (512mb, MXM), 4x2GB 1333MHz (Samsung/Hynix?), Seagate 500GB SATA (macOS 10.13 High Sierra), 1920x1080@60Hz LCD panel

 

And 2 old working rigs that are pending the arrival of their IDE drives and installation of their systems (sexy Athlon XP and Pentium 4 with HT rigs), gonna get retro 😉

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