I have an early 2009 Mac Pro 5.1 running Mojave with a Sapphire Radeon RX 580 graphics card. I installed the latest OCLP 1.5.0 and created a Ventura boot USB drive. Despite pressing the Option key when rebooting, I just get a black screen.
How do I get the boot screen working?
My monitor is a 4K Samsung connected via display port from the Radeon RX 580
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