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How to start up your Mac from a bootable CD/DVD, USB thumb drive or external storage device
Old iMac won't boot. Tried to boot Linux via USB, but got this awesome effect. I suspect a failing GPU. : r/techsupportgore
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Replacing an iMac Hard Drive with an SSD
Create a bootable usb for old iMac | 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
iMac won't boot from USB, white screen + … - Apple Community
Adding USB3.0 to late 2009 iMac (11,1) | MacRumors Forums
I got a 2009 iMac but it's got a password, any way to factory reset it? : r/ mac
MacBook Pro mid 2009 won't boot from exte… - Apple Community
