Using OpenCore patcher to install later macOS on an unsupported Mac

Using OpenCore patcher to install later macOS on an unsupported MacI have a Mac Pro (Early 2008) running El Capitan and I thought I’d try the OpenCore Patcher to install Monterey. Installation of the patcher and making a USB installer went fine, but when I reboot and hold down the option key to select the boot drive nothing happens. The screen remains black and there is no hard drive activity. Any idea what’s wrong?

submitted by /u/Plus_Chicken_5708
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