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Need help changing boot order ~ Zorin ver 8 installed on iMac


I have searched a lot of places and have been unable to find an answer to this.

I have Zorin ver 8 installed on an iMac. I want to install Zorin 9 and I have it on a CD as well as a USB thumb drive (bootable) My problem is getting the iMac to boot to either the CD or the thumb drive.

I have tried to get into the MAC BIOS by holding down the Windows key, Alt, O & F keys (I don't have a MAC keyboard) but it does not work.

Any ideas/ help would be greatly appreciated.

Thanks in advance!



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