21.5" iMac Mid 2010 Won't Boot from USB to Install High Sierra - Ask Different
CloudReady doesn't boot from USB properly on my 2009 21.5" iMac, it gives me this weird screen, how to fix it? – CloudReady
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iMac Late 2009 - Bluetooth and USB keyboard and mouse do not work on Big Sur installation screen · Issue #43 · barrykn/big-sur-micropatcher · GitHub
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iMac 2009 option key does not show boot o… - Apple Community
iMac 27" (2009) dies at 60% of USB boot | MacRumors Forums
Create Bootable Windows 10 USB memory on Mac mini 2009 late | MacRumors Forums
Got a iMac Late 2009 model A1311 for a very good price, made a bootable USB drive for El Capitan and this shows up. any ideas? All help is appreciated : r/osx
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2007-2008 IMAC I think will not boot past… - Apple Community
Late 2009 iMac, completely wiped hard drive, cannot boot from usb, holding option brings white screen with mouse : r/mac
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Is there a way to make a 2009 MacBook (A1342) boot from USB? - Ask Different