Grub Open Firmware error - release keys

Casey C <[email protected]>
Newsgroups gmane.linux.debian.ports.powerpc
Message-ID <CABE8pbVSejj+vBrD5AbbTcVooyv5tEBw1B0PeZnGs9XFFHrXZA@mail.gmail.com> 
When selecting default install from the grub menu, I get a loading message,
then an Open Firmware error saying to “release keys to continue!” However,
no keys are being pressed, and the system is unresponsive to typing
anything on the keyboard. I’ve tried multiple keyboards including a wired
Apple keyboard. Has anyone experienced this or does anyone have any idea
what may be the cause?

Image of Open Firmware error:
https://ibb.co/kDZS5RG
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