Both of them.
My XP laptop (old)
And my Mac running Panther. My desktop mac, not my broken MacBook.
I started out w/ my iMac.
I wanted to install Ubuntu so I put the disk in, restarted, and held down “C.”
Nothing. Just boots up completely normally.
Then I went to my XP.
I put the disk in, restarted, and pressed f12 when I was told to.
I selected to boot from the CD drive.
I pressed enter, and the screen goes black with a little flashing underscore in the top left.
It does nothing at all, says nothing, no text, no sign if it is reading the disk.
It then boots normally.
What am I doing wrong?