My older Dell laptop would hang up at this point. Other computers work fine.
The problem was identified by:
Use "boot: bt debug".
Hit Ctrl+d to continue twice.
Type "mkdir /mnt/cdrom"
Type "mount /dev/hdc /mnt/cdrom"
The computers that work would mount the cdrom. My Dell would give a bunch of errors and never mount the cdrom.
The solution for me is to boot off a USB device.
I use the CD to boot with:
"boot: bt nocd"
This boots a laptop that can't boot from USB, to the point where it can load the modules, ect.. from a USB device.