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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I have no OS on my Mac 2008 and can not b… - Apple Community
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2007-2008 IMAC I think will not boot past… - Apple Community
So bricked my real mac by accidentally installing the clover tool to it instead of the USB when making a bootable USB a week ago. It was Catalina on a APFS drive :
iMac wont let me choose boot option - Apple Community
