How to Boot Mac from USB | Mac Won't Boot from USB Troubleshooting
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The OptionKey Blog: Installing Windows 10 on old Intel Apple Hardware
Create a bootable usb for old iMac | MacRumors Forums
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boot - Installation of Ubuntu 18.04 on iMac 21,5-inch late 2009 - Ask Ubuntu
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Late 2009 iMac, completely wiped hard drive, cannot boot from usb, holding option brings white screen with mouse : r/mac
MacBook Pro mid 2009 won't boot from exte… - Apple Community
How to Boot Mac from USB | Mac Won't Boot from USB Troubleshooting
Tech Tip: How to Boot and Use a Mac in Target Disk Mode
