Step 0: Have a way to boot Windows on the iMac (either on the internal drive, or in my case, plug in a hard drive from another computer - in my case, the drive with Windows 11 (EFI mode booting) from my Mac laptop (a 2009 year model MacBook Pro). (Other stuff needed, aside from iMac and new GPU: access to another computer with Linux or macOS (or a linux live boot disk), CH341A or similar EEPROM programmer, soldering iron, 1.5 or so foot long piece of 3 conductor wire (I used a piece of telephone cable, and removed one of its 4 wires), optionally a PCI Express 6-pin power header extension, and a toggle switch (SPDT or DPDT (single/double pole, double throw) ON-ON or ON-OFF-ON type)). Thanks so much, vB, and for all their amazing work that made this possible! (By the way, am I the first one to have done this successfully so far? surely someone's done it in the two years since it was first discovered - but it doesn't seem to be much talked about?) Bootscreen is working without an external monitor connected at all. In a nutshell, Nick D's EG2 VBIOS, corresponding iMac firmware mod, and iMac backlight wiring mod. IMac 11.3 (27" Mid 2010) AMD Radeon Pro WX4130 Boot Screen Mod Success!
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