I get a black screen that looks like this:-

1.


2.

Select CD-ROM Boot Type:

There is a flashing cursor but no keyboard inputs are recognised so that
is as far as you can go.


Something has changed in the linux installer iso over the years.

debian squeeze, fedora 13, ubuntu 14 are the most recent CD iso that
will boot on my iMac 6,1 from 2006.

OpenBSD 6 and NetBSD 7 boot and install. FreeBSD and variants don't boot.

If you like supporting old hardware you might want to investigate what
the problem is and fix it, and if you can get it done up-stream so much
the better.

The hardware on my iMac is an Apple mash-up of 32 bit UEFI with a 64 bit
processor. Old Apple hardware can be had cheaply and is good quality,
Apple abandoned us years ago so there ought to be quite a few people
like me eager to run a recent OS on it.

I was running debian sid, I'm going to go through the tedium of
installing devuan jessie by starting with debian squeeze.

I don't use OpenBSD or NetBSD on it because the sound doesn't work. A
problem with the azalia driver.


DaveT